Mac 2002 SS

iTrader: (6)

What are your E.T.'s/mph gains with the cut-out open vs. closed at the track ?

I may be ordering a DMH one soon myself.

Larry @ AMS

iTrader: (1)

The gains are going to more based off the restriction of the catback.

I run a DMH cutout on my 4" catback and see no gains on the dyno or track. We have a 3" DMH on my fathers 01 Z/28 with a SLP dual/dual and see 10ish rwhp NA on the dyno and 1-2 mph gains at the track.

cutouts are cool either way and it's fun to scare people . LOL

Mac 2002 SS

iTrader: (6)

I have the same cat-back like your Dad has. 10+rwhp on the dyno is nice, but I want to see true "TRACK 1/4 MILE " results.

When I had my 93 Z-28 h/c car back in 1994/95 with a cut-out , it ran a solid .2 tenths and 2.5 -3 mph quicker every time. I had a set of Hooker LT's and Sinlge Outlet 3" Flowmaster at the time.

So I guess I'm finding it kinda hard to beleive with all these guys on this board with h/c cars with a "cut-out" aren't getting at least a solid .2 tenths and 2-3 mph more open up. LOL ,with that 4" exhaust you have man.... your exhaust is "open" all the time. That's a beast of an exhaust !

Larry @ AMS

iTrader: (1)

I can see you gaining big with that Blowmaster you had. I did not expect to gain anything with a cutout, but it more for the rowdy / scare factor.

I say 10rwhp is seen on average from most 3" catbacks with a cutout and 1-2 MPH. We see 2-3 MPH on spray with my fathers car with cutout open v's closed. These gains all come down to the more power you make and the more restrictive the exhaust becomes.

chrs1313

iTrader: (24)

3-3.5mph gain over stock z28 catback

Camaro Z

iTrader: (5)

I gained 10 rwhp on the dyno vs. my Flowmaster muffler (probably similar to your dual-dual). I imagine if I was more than a bolt-on car that the gains would be more. I've never track tested it.

2001WS6Vert

3 MPH average gain.