Barry, thanks for posting up your dyno plots and the superimposed one is really helpful. Seeing your before and after dyno plots on that dyno day easily made up my mind for me. So easy in fact I ordered a 1/2" spacer that night. Seems to be one of the best bang for your bucks mods so far besides sway bars.

Darren

 

Tony, got any more $200 mods that can give us 10+hp. Tell us what you are working on right now so I'll know how much I need to save up.

 

Can't talk about them just yet.

 

I just installed the 3/8" spacer on my '05 6MT. All I can say is that the butt dyno is pleased. I don't know exactly how much of a difference it made, but it's definitely perceptible. I'm happy.

 

I just received my 3/8ths spacer and installed it this weekend.

First of all, the shipping was quick. The packaging was excellent.
All the bolts and washers came packaged in separate baggies and they
were all labeled. It also came with instructions so I didn't have to go
search online and print them. The spacer "kit" was more professionally
packaged than most of the other aftermarket kits from big companies
and there were no missing parts.

Now, in terms of power gain, I couldn't feel any.
Perhaps my butt-dyno is not as sensitive as others (I didn't feel any gains
when I installed my intake, either).

However, it seems like I build up speed a little faster now, although I
can't be sure. Maybe I need to give the ECU some more time to adjust.

Overall, I'm pleased with the product, although I didn't feel a dramatic
kick in the pants, I'm faithful that it added some extra HP based on other
people's dyno results.

 

You're not crazy!! My impressions are identical to yours. Tony does a great job with packaging, instructions, careful bubble wrapping, etc. However, like you, I just installed my MD 3/8" Plenum Spacer over the weekend AND I reset the ECU (unhooked the neg. battery terminal; left it overnight for 12+ hours), and I still don't feel a real significant difference. My gut tells me that I've gained HP and like JoeyG35, I think my car is pulling harder and faster, but it's too tough to know for sure with just the "butt dyno." I also have no idea if my 0-60 time is any faster or not; I want to say yes, but again, I'm not sure.

I found this to be interesting b/c when I first installed my Z tube/K&N filter (my first mod; which is a $75 Z-tube/$35 K&N air filter - combo mod compared to the $225 MD Plenum Spacer), I knew there was a difference going from stock, and I heard it (above 3,500 rpm of course) as well as feeling it all over the power band. With all the talk and dyno's on the new MD Plenum Spacer adding approx. 7-12+ HP, I thought for sure I would feel the same after installing it. Sorry, I don't hear or feel much difference with the MD Plenum Spacer...not yet anyhow. Overall, I'm still ok with it, but hopefully, I will realize a significant difference soon. It's strange, b/c some ppl have suggested that adding a performance mod (such a a Z-tube air intake) that supposedly adds negligable HP (like 5-7 HP), it's very tough to feel a difference; yet, so many ppl have sworn they've felt such a dramatic difference with the MD Plenum Spacer which supposedly adds about 7-12+ HP...just a few more HP than the Z-tube. However, it appears as if I've had the opposite experience. I not completely disappointed with the MD Plenum Spacer, but I was expecting more. Anyone else have similar findings with the MD Plenum Spacer?

 

The packaging, shipping, service and the product were better than anything you'd get from amazon.com. Great service from Tony.

With that said, I installed my 3/8" spacer a couple of weeks ago and did not notice too much right away. But...I noticed slightly less drop off of power in the very high RPMs. After a few days of driving in normal traffic conditions, I had some opportunities to drive a little harder (less traffic on the roads). I then noticed more power from maybe 3000 RPM upward. Not a lot, but enough to notice. I like that it seemed to add power in that low to midrange. The top end definitely saw quicker revving above 5500 RPM--it approached redline faster. Keep in mind that I have high flow cats and a Z tube as my other mods. Bottom line is that I'm definitely satisfied with the spacer. No question.

 

interesting.... my intake mods I couldn't feel any diff (Stillen high flow and Z-Tube), but the spacer I felt for sure.

As a point of reference, at the dyno day this weekend, one guy with a G coupe(6MT) who had exhuast, z-tube, Pop Charger, Technosquare reflash, etc... dyno'd then they installed the 3/8" spacer and re-dyno'd and there was a ~8RWHP gain (so about 10Hp at the engine).

 

I believe it; just saying it was difficult for me to "feel" or perceive an increase in power while driving it around today (and I definitely wound it up quite a bit - I took a nice "spirited" drive since I reset the ECU overnight). As jjellyneck has eluded to, I'll try to keep a close tab on any perceived HP increase especially above 3,000 rpm. I can say for sure that I do not hear any difference whatsoever...maybe I'm just really used to the sweet sounds of my engine and Z-tube at the higher rpms and Coupe midpipe at lower rpms. I wonder if those ppl who also "heard" a difference with the MD Plenum Spacer didn't have the Z-tube????

 

bsgoren and JoeyG35...I have a similar feeling towards the spacer...I'm not sure if I can feel the difference. I think the car picks up quicker...but just can't tell by my "butt dyno." I guess I was also expecting more from all the hype about the product. Don't get me wrong, the packaging, quality and customer service was excellent.

I may take the spacer off, drive the car a little, then reinstall. Maybe that may help me come to a conclusion.

 

Hey Sickon

That was my car that was dynoed twice. First without the spacer and then with the spacer. Solid proof that I got 8rwhp. This is a must do mod. There should be no debates.

 

Hey guys, Tony installed mine at G-day(Chino Hills, CA) after I won a spacer in the raffle they had. I can say that it was a great first mod for me. This is must do mod!! I can say that the ride home from G-day was pretty nice. I felt a significant difference. Plus it is great to see how the spacer did as the only mod on my new 05' coupe. So this goes to show that without any other mods on the car that there are great gains by gretting th spacer. Now all I need to do is dyno sometime.

 

I found this thread in a post this morning and I need some answers please.


neffster
FGC President & Founder
Join Date: Feb 2004
Location: Oviedo, Florida
Posts: 3,459


The short answer is a few questions. What is your goal?

If you want good performance for a fair price, get the spacer.

If you want maximum performance for ~$100 more, get the plenum.

If you do not plan on modifying your headers, cats, exhaust, etc... get the spacer.

If you think you'll turn into a mod junky (don't be in denial) get the plenum.

The above is just my opinion. YMMV.

Okay this is what im dealing with. My G35 is stock, all I have is the HKS hi power Exhaust system. So if i install a 1/2 moto/ spacer on my G will i benifit from the 1/2 spacer? According to Neff im going to have a negative experience with the spacer on my G because I have an exhaust system installed. Need some feed back please.

This is whats really bothering me..
If you do not plan on modifying your headers, cats, exhaust, etc... get the spacer. <===Why ???????

 

The person posting that is tied very closely to Crawford, and this is how Crawford does business, they send people out to spread mis-information and try to discredit competitor's products. Many are using the spacers with all kinds of combinations of mods and having very good success. It should work fine with your mods.

So far Crawford has lost at least 150 potential plenum buyers who opted for a spacer instead, which is quite a lot of business. I can almost understand why they are so upset but it is still no excuse for their poor business practices.

 

What I see happening, coincidentally, is that Copbait is dis-crediting Crawford for Hydrazine (who IMO deserved tons of credit for his efforts and contribution overall). Probably not doing it on purpose - BUT NEITHER IS CRAWFORD's "CRONIES". If you noticed, the folks who tout Crawford have asked some good questions and even if they seem hostile to YOU, and they tend to be otherwise very zealous posters anyway. Just because you don't like the posters comments, doesn't mean they are working for Crawford. Copbait you essentially doing what you claim the Cronies are doing? Trashing a verndor for the sake of another. Who gives a dam they are both pretty good mods.

I've been following the spacer evolution for a while and never have seen any more than an 8hp gain (other than best spacer vs. worse stock run from the original thread). Where are you getting this HP # that beats the 11-14hp (don't quote me) plenum gains I believe Crawford has proven. The Cronies may swear by Crawford but to say that he has them working for him is ludicrous and a $hit spin on reality. Is that so you feel better about the money you spent on your mod? People are adamant about what they do to thier car - get over it and quit being so paranoid. You think Crawford actually wants controversy that could affect his reputation? Doubt it. There may seem to be a correlation in your fantasy, but you have 0 facts to support your conjecture - right? Doug had it alot worse when they discountinued the Z. Now I doubt he is staying up at night because more and more effective mods are making it to the market..in fact if he's as smart as he sounds I bet he could have anticipated it. All this crawford vs spacer crap is the result of a bunch of I'm better than you are childishness and bastardliness. People who are true enthusiasts realize there will always be something better and there will always be a reason to do it a better way.

Crawford can sell a spacer if he wanted to. He believes it's not as good. Most people find similar gains and some just prefer to use a guy that has a terrific reputation and who consistently provides quality performance adding products. If Hyrazine can do it and compete then more power to you the consumer. Everyone is so paranoid. This misinformation war is a retard fest that needs to end. If you talk to Doug he'll tell you he is all for anybody making a better mod that results in a better car. He didn't get a solid reputation bashing other peoples efforts and I have not seen that he has. Neffster may have and he apologized and spelled out exactly what and why it happened. He's nuts - but I doubt he Doug's bitch. People who know what's up will ignore this BS and read the pages of actual tech talk and make the best decision for them. Anyone who spent 450-600 on the crawford would not flinch at spending 200 on a spacer if they thought is was better. Making mistakes is part of the learning and fun. What happened to the spirit of this board - ya'll are killin it.