ARCTICWHITE98Z28

iTrader: (1)

How much horsepower can I expect to gain from a 3" cutout on the I pipe on a stock 98 Z28 exhaust system? Thanks.

AOC

With stock exhaust manifold, 5 - 10 rwhp.

ss ware

dont waste your time. At worse get long tubes and cutouts.

dug

iTrader: (10)

I picked up 1mph at the track. from 107 to 108. Not bad for less than $100. Also I like the sound.

Brandon Boomhauer

iTrader: (10)

its proven to gain power.
I gained 8rwhp/12rwtq

Wicked_Hugger99

iTrader: (1)

u'll gain 5-8rw easy imo. Its a great budget mod!

soslo

iTrader: (12)

I gained 12 rwhp and 8rwtq

baloga41

i gained 17hp and about 10 tq out of the qtp elec. cutout .at a trafic light next to a exotic car it will give you about 75 hp and about the same in tq of terror when you open it lol tried that many times pluse you will hear the music of the g5x3

soslo

iTrader: (12)

here is my dyno showing the gains

TN94Z

iTrader: (14)

The dyno showed a gain on mine also, but at the track I have worse et's if I open it

mrr23

iTrader: (3)

you aren't the only one. i gained 11/13 on the dyno after 3000 rpms. here's what happened at the track.

This is with 200 n2o.
distance ---stock ----- cutout
60ft ------ 1.987 ------ 2.074
1/8 ------- 7.902 ------ 7.912
mph ------- 93.20 ------ 93.97
1/4 ------- 12.102 ---- 12.080
mph ------ 117.12 ----- 118.06


on the positive side, the most gain i've seen is .1 in the 1/4 from others. if your looking for power, good luck. if you're looking for real loud exhaust, go for it.

soslo

iTrader: (12)

This is an odd quote...because you gained 1 MPH with the cutout open. Also, your ET was better, despite having a tenth slower 60ft. So you probably would have gained .15 to .20 with the same 60ft.
These are typical gains...

Rescue Ranger

iTrader: (10)

These gains are respectable for such an inexpensive mod.. plus the sound

mrr23

iTrader: (3)

just goes to show the torque loss BELOW 3000 rpms you don't see on a dyno.