would there be much of a performance difference between having cut outs pre cat (so you'd need 2 cut outs) or just one cut out post cats but before the muffler (need only one cut out)

 

if you put the cutouts before cats your going to get a ses light and run very rich, unless you have the rear 02's turned off.

 

i honestly dont see any performance gains with the cutouts, it actually feels alot slower. i have mine post cat.

 

I think that I you have a big enough exhaust diameter the whole way back (ie 3.5"-4") then there is no need to have the cutout. That is what I plan on running and shoudl make well over 700rwhp doing it.

 

Well i just installed a DMH cutout on my silvy. No joke, before the cutout, i ran a 15.8. with the cutout open, i now run a 15.50. I have the slips to prove it. Before i had just one pipe going into a 50 series flowmaster. now i have the cutout right after the collector, bypassing the 7' of pipe and the muffler.

I am extremely satisfied with mine. they dont leak either. Stay away from qtp!!!

Speaking of cutouts, now that i have one, should i have my truck retuned?

 

I can vouch for that. Mine's about 1/8" away from sealing, and it sounds like

 

I have dual manual 3" cutouts right at my collectors and I love them... I also have all 3' pipe in y system so its not bad either way, but on the dyno it got me 12hp/15tq over closed exhaust... I dont have cats... the cutouts are right after the collectors on my pacesetters.

 

well I run 2/10's and 3mph better with my cutouts, but this is my setup and not everyone elses, Every truck acts different to each mod. Good luck.

 

thanks for your alls help...anyone try these?
http://www.pfyc.com/store/merchant.m...ory_Code=GNEXH
the y piping is another $45 but still the cheapest i have found. are they quality?

 

That's the QTP. quality? not in my opinion.