JMLPD383

I have a choice on my hands but not sure what to choose. I can get either a 75mm throttle body or a 70mm but which one? Ive heard that 75mm could hurt my bottom end power and thats why im askin.

josh.davis

70mm, The Accufab 70mm/elbow makes more power than the 75mm..... it even makes more power supercharged too.

JMLPD383

Im goin with a c&l plenum and throttle body would the same still apply to go with the 70mm

josh.davis

http://www.amazon.com/Building-5-4l-.../dp/1932494200
buy that book.

as for the C&L, it will still make power but i not 100% sure it will be the same as Accufab...

EaZy DuZ iT

how much rwhp can you except from accufab tb n plenum?

josh.davis

11-14hp with a cold air intake.

Cassies01GT

I dunno the heads can only take in so much air, I thought they were getting close to that limit with the stock TB and plenum.

MJH78

After doing a lot of reading on here, I'm under the impression from guys here that know a lot more than I do that the GT motor itself is where your bottleneck is. seems like you could open up both the intake and exhaust side, but there's just so much you can do with a 2V motor. You're looking at like $1700 to do CAI and TB, headers, midpipe and catback. What is that going to get you...20 rwhp? Since I am not going to do any type of FI I just said to heck with it, it's not worth the money. I've decided to get some 4.10's and save my money for the times when something needs fixed on the car.

josh.davis

an off road H pipe, and a nice catback exhaust..is a must for me,but its your car!

If you want a car that takes mods better, buy an Ls1 or ls2.

Mark99GT

75mm FTW

Look at these dyno graphs

http://www.cnlperformance.com/plenum11.html