1lowgmc

I have a nnbs 4.8, with lt's,no cats, dynoed at just under 350rwhp, with heavy 22's. I currently run a 3" y-pipe, into a super 44. While it does sound good at times, I could use a little quieter set up. I am thinking of going true 3" duals with an x-pipe, and 20" magnaflows. Is the 3" overkill or would like 2.5" be better. I do plan on a few more na mods to get me too the 400hp mark.

musclecity85

iTrader: (5)

if your just looking for a quieter setup you could just swap muffles. i went from a flowmaster 50 series to a magnaflow and it toned it down alot. no more drone on the in the cab, but a nice deep sound outside. and i think a single 3' exhaust is rated to like 450-500 hp, so you should be good with that. Im sure true duals with an x pipe will have a different sound, but sound good at the same time

also whats your setup? cause 350rwhp from a 4.8, im sure your truck rolls out

03sierraslt

iTrader: (22)

We need to know the whole setup, because a 4.8 with headers and exhaust isnt 350hp. But yes, dual 3" is overkill.

black00chev

iTrader: (2)

Stay with a single 3" or do dual 2.5".

But im a simple man and say keep it simple with just a single 3" with a bigger muffler.

1lowgmc

I have a custom cam, lsxrt, double springs, pushrods, CAI, built trans, 3200 stall, 2 piece driveshaft, 4.11 gears w/truetrac, probably more hard to keep track sometimes. I was thinking a true dual with xpipe may gain some low end, from my research. But trucks are much heavier. Thanks

03sierraslt

iTrader: (22)

So the 350hp is a estimate.

1lowgmc

No it was dyno'ed by PCM of NC when the can was installed.

JohnDaMan

iTrader: (7)

Is this your truck?

Why not ask Alvin?

danny23

I agree i will.like to.know.your set up it will be nice to get the much hp with just LTs,,, im running lts x pipe with 3" pipe and stock cats and e-fans ls6 intake ported tb and a tr220 and maybe im putting like 300-330 rwhp maybe not sure

danny23

what are the spects for ur custom cam u have some nice number for a 4.8 with a cam,, nice bro