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I was trying to find a dual cut out y pipe set up for ls1 fbody sand can't seem to find one. I have seen them before but not sure who makes them for these cars anyone know who does?
The only ones I've seen are right after the collectors. Not sure about any others. You do know that you won't gain any power with a dual vs single cutout right?
I haven't seen a Y pipe with dual cutouts pre-fabbed. But HCI is right. There would be little to no gain in power for a dual cutout vs. a single at the I-pipe.
Can be up to 10 hp difference depending on the Y pipe in question. A lot of Y pipes are marginal designs and some are horrible.
I think how much gain will depend on the Y pipe design and supporting mods based on my experience and results.
My 99TA has a Mufflex Y pipe dual 3 inch Flowmaster style y to 4 inch single to single 3 inch cut out to SLP Dual/Dual. The cut is worth 10hp over the 3 inch I pipe & SLP Dual/Dual. The single cut out open is loud but bearable. I've driven around for months with it open. The TA made 408 and 418 hp at wheels.
My 91 RS has dual cut outs off of the header collector to Hawk's Y pipe ( Flowmaster style y) dual 3inch from headers to 3 inch to SLP Dual / Dual. The RS gained 20 whp with the dual cut outs open over the 3 inch I pipe & SLP Dual / Dual. The dual cut out is insanely loud a couple of minutes max is all I can tolerate. The RS made 445 and 465 hp at wheels.
So the twin cut outs will be worth about 0-10 whp over a single cut out depending on the cars other mod's , Y pipe design and hp level based on my experience.
Compared to a sucky y pipe like Jet- Hot used to sell...it might be even more.
I do not have duals but here is mine in the I pipe.
Remote controlled electric cutout.
Cut out a chunk in the I pipe, have it welded in, bolt it back in.
Having duals after the collectors would be so damn loud lol. Start your car with Lt's only.
^This was bothering the hell out of me as I remember years ago a company did make one. After searching it seems like it was QTP that actually made that Y-pipe.
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Dual cut out y pipe 
