Looking at the fast intentions website it seems that the gains are about +10whp with just the exhaust and +20whp with the exhaust and resonated test pipes on an otherwise stock car.



Is this correct?

if a stock 04 6MT dynod 230whp on a dynojet, these two mods would send it to 250whp?? That seems like a lot..

 

its different with every car

test pipes will easily hadd from 8-15whp, depending on your car (so says my friend at nismo)

 

so the gains are completely believable...thanks.

 

The gains you see on our dyno charts are believable. If you have any questions, feel free to contact me @ 818-882-2788...Thanks, Tony

 

thanks again for the help.

i read that some mods give and take from the gains of others.

if i got this exhaust and added a spacer or nonrevup-mrev package to my car, would that plenum mod add to exhaust gains? or would i be better off with just one of the two? or is the answer not that clear cut? FWIW i will be unable to tune...

 

Trey recently went from aftermarket cats to test pipes and he only saw a very isolated gain in the upper rpm ranges. Basically anything below 5900rpms showed no gains what so ever. If you want improved acceleration you must elevate the entire powerband, just not the upper portion. You can gain 40 whp from 6200-6500rpms and the car will be no quicker in the 1/4 mile.

 

^^ well put Mr. B

 

well the dyno test above seems to show solid hp gains through the car's powerband


any thoughts on the plenum vs exhaust issue? would adding a plenum have an adverse effect on a car with exhaust + tps?

 

Technically - when you increase intake, the car adjusts itself and also adds fuel to compensate. This results in a hotter explosion in the chamber and therefore 'more' exhaust pressure as well.

Typically - when you increase intake capabilities, you want and should increase exhaust as well for this reason.

When I was in the early stages of testing and working with Tony on this system, I saw similar HP gains as the dyno's show. I tested with the intake mods and without, before the exhaust went in as well. I got more out of all of my mods when combined with exhaust....

Rick

P.S. don't forget our Fall Sale in the Marketplace - 5 days left!!!!

 

When you install an MREV, spacer, test pipes, and dual exhaust you are going to alter your A/F ratios and change your timing needs. Test pipes and spacer especially create the need for eng. man./tune (and they are also the best mods for hp gains). Unless you invest in some engine management and a good tune you could possibly loose horsepower.

To get the max gains you need to go w/ a UTEC (my advice unless you are going fi..THEN GET THE V-PRO) or some type of eng. managment. Then you will see significant performance gains.

 

thanks.. but i dont have the ability to tune as i have no dyno or tuners in my area

 

A tune isn't a must - but if you want the most out of your mods, it should be done.

If your only going the to simple bolt ons, no FI, you can get very well away with a TS reflash - the full spec. It does work very well in these cases and costs 1/2 of a UTEC and requires no additional tune.

Other than that, you could get a wideband unit and an APEXI SAFCII and adjust A/F on your own as well. There are options.

A UTEC with wideband - the easiest way to self tune as well - though more cost. For simple NA mods, no heads or cams, it can be a bit of overkill - but a great solution.

Keep in mind, a UTEC for about $1,300 and install, or a TS flash and an AF controller for about $900 - not much different there, and the UTEC will get you more tunable options.

That $400 though may be well needed for other mods or just savings that are worth it.

Bottom line - there are several options in tuning - all Dependant on what you can afford now, later, and based on your mod goals overall.

Rick

 

If you are capable of self-tuning, then the UTEC is the way to go.

 

No doubt here...as long as you have the knowledge.

KenK2 does his own tuning via UTEC and is very knowledgeable as well...PM him for his thoughts.

Rick

 

I pmed Ken a while ago...wanted to see if he resolved his prob....never got an answer....was it timing?

For the OP, if you just want an MREV and spacer, reseting the ECU should work (it did for me and I got noticeable gains). Add a dual exhaust w/ the stock cats and you should still be OK.

However, once you throw in the test pipes (which will give you a legit 10 HP...but only if you adjust your A/F ration) and then you must get eng. man. and a tune.

A lot of mods w/out management and tune will actually make your car slower.