Hey Z1. ETA on those headers?

Originally Posted by Joepro

My graph is on page 23 of this thread, I did 322 whp and 272 tq(yest I rounded up) With the headers as stated before I was expecting 330, because the average non header z tunes in at around 315 as an average from what I have read on th forums. Vince(the tuner) told me they only see higher hp on cars with long tube headers, but my TQ was identical to the Z they pulled 341 whp out of and 272 tq, BUT that Z did not have the M370 which has been said over and over again to lose peak hp and gain tq. Also we do not know the temp when that Z was dynoed, they posted the video on august 1st, the temps were in the high 70's then, and it was raining almost all day when I dynoed- they like to tune in the morning, I was scheduled at 9 but was late due to the colossal rain store and Vince got tied up with and other car, he did not do the final pull till after 1 and it was up in the 80s at that point. If I ditch the M370 and re dyno and achieve 330 or higher, this proves the headers help. also we need some comparisons, who has some non header z graphs that are up rev tuned?

here is mine again:

Originally Posted by chuckie311

I beg to differ on the M370 saying you lose peak HP here is my dyno just after installing the M370

Originally Posted by DEpointfive0

It seems to be hit and miss, I lost 2-4WHP, but gained a LOT midrange. Mike said there was ZERO difference throughout the power band (hard to believe) and some people say they lose 7+ WHP, which is also hard to believe too

Originally Posted by chuckie311

I beg to differ on the M370 saying you lose peak HP here is my dyno just after installing the M370