RJM02GTDrag

I hate to be negative but you put on a great intake system and your stock plenum will not allow it to help as it should. The pro chamber is a great choice and losing the cats alone is a big help but running back into a smaller diameter stock exhaust pipe and mufflers is choking any HP gains you will get. You may have got 10 -15 rwhp total, but a few more mods will pop you up fast, cat back, plenum, pullies, and these cars really need gears.

jishead

I am seriously thinking of upgrading TB/ Plenum. I hope it's not one of these things where you spend $400 to get 3 HP at the rear wheels. I'm afriad that on my exhaust I have most certainly eliminated the hugest bottleneck and if I spend $350 on magnoflow catback or something it will be only another 3-5 Hp. I guess that's how it is with bolt-ons huh?

Also, is there some point on a mild bolt-on setup like mine where putting better flowing TB/Plenum/Intake type stuff could actually hurt HP/TQ especially down low RPM's? Maybe like it would reduce the air VELOCITY or something? Probably a huge mystery just like exhaust backpressure that only the dyno could tell me for sure? I would really like to be 300-325HP at the crank and then be happy. I swear juding by marketing claims, other folks experiences, and the pull and feel that I am aprox 290HP at crank (gained 30 with densecharger, MAF and OFFroad pro-chamber.). I am thinking that my GT pulls about as hard as my friends 280HP Z-28.

mdvaldosta

stay below 70mm on the throttle body and your velocity won't be a concern. Best bang for your buck is a 70mm TB and a ported stock plenum. If you went all out with an accufab setup your gonna best spending $400+ for just 6-7 hp. Much better to do that mod last financially wise.

RJM02GTDrag

You are on the right track but I question if you got 30 hp with your set up. the densecharger cant work to its capacity with the 65 mm throttle body and stock plenum. Go 70 mm Tb and c/l plenum for less than $400 and let your intake flow. And getting rid of that stock catted mid pipe was great but your pro chamber is running back into a restrictive stock 2 inch muffler system, that has to go. All these things work together.

Dan04COBRA

I'd say 235-245hp. The stock cat-back isn't helping you at all.

jdaniel

Thank you. I have been wondering where people are getting numbers over 250 for FWHP here. Makes no sense.

jishead

Ok. As my signature indicates, my hardware has changed and I went to the dyno. Now we know:

'02 GT, 5speed, mineral gray, St. Louis area
ProChamber
Magnaflow C/B
Densecharger (full length)
85mm PRO-M MAF
Steeda UDP
250 RWHP, 288 RWTQ
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