This is for an 03 sedan 5AT (obviously non-RU engine)

Already have: Stillen exhaust, Stillen intake, MD 5/16" spacers...

http://www.avalonracing.net/catalog/...ts_4620734.htm < Alphawerks Header & Hi-flow Cats ($896.53)

http://www.sportcompactonly.com/prod...=2&mk=Infiniti < Alphawerks Header ($699.97)

http://www.crawfordz.com/headers.htm < Crawford Z headers ($981.00)

And, given the mods I have and having non-RU and 5AT, what kind of power can I expect (RWHP and Torque) and how will it effect my powerband? I don't want it peaky, I want it pretty evenly distributed throughout the RPM band.

Or do you have any other suggestions? I'm gonna keep it N/A unless I somehow come into a TON of $$ as I plan on saving that $5-10K for a new car in 2009. But, alas, I'm having REAL trouble fighting off this bug, and have given into the spacers and about to purchase the grounding kit from Gordgee.

 

alphawerks headers and hi flow cats

 

Alright, is that a good price or pretty average? Or is that on the over-paying side?

And, given I've got non-RU engine and 5AT, what kind of RWHP can I expect w/ 5/16" iso-thermal spacers from MD, and Stillen intake and exhaust if I were to add Alphawerks HFC and header?

 

You can plan on running lean without a reflash or piggyback from what I've read.

 

I was just thinking about that. How much do the piggy's run? $600~?

 

Wrong.

I've got similar mods - k&n/z-tube, 5/16, topspeed headers, kinetix cats, custom true-dual AND Zeitronix wbo2. I've done quite a bit of logging the past couple of days and have not run above 15.3 under any throttle/rpm situation yet. Of course, I will get more power once I get some more fuel in there, but average afr is stoich @ 14.7ish under most conditions.

Go for the headers/cats. You'll love them!

 

How much of a power difference is there w/ the header/cats in addition to 5/16, intake, and exhaust? Pretty noticable? How about the sound?

Thanks!

 

Your stock sound will get louder. I love the sound of the stock cat-back with headers/cats combo. However, you will probably experience quite a bit of rasp, as I did, with the stock catback. So I had a custom true-dual made. No more rasp, but I had to use the Maganflow resonated x-pipe like others have talked about. A pair of individual resonators and a separate x-pipe did not cure the rasp on the true dual.

You will certainly notice a performance gain, too.

 

Ya, my main concern - given the price - is the performance, not so much the change in sound. I was just curious to know how big of a change in sound the headers/HFC would add with having Stillen intake and exhaust + 5/16" spacers from MD that I got already.