SPANKY LS1

iTrader: (24)

My new head and cam combination is G5X() cam, and AS stage 2.5 (large valve stg 2s) 5.3l heads, milled to ~11.5 to 1 compression. My exhaust currently consists of Hooker LTs, Hooker ORP, and Hooker catback. I will be installing a 3" cutout in the intermediate pipe. My question is this, do I have enough exhaust, or would I greatly benefit with true duals? I have the BMR Extreme torque arm (with the crossmember that makes true duals almost impossible), and true duals would be a major hassle at this point, not worth a 3-5hp gain, IMO. Or would I gain signifigantly in going to a 3" x-pipe dual setup? TIA, Shawn

Colonel

What size is your Y-pipe? If it's a 3" Y into a 4" Y-collector with 3.5-4" all the way to the cuttout (I'd go with a 3.5" cuttout if this is the case) then you're good to go. This setup would make as good or better power than dual 3s, IMO.

SPANKY LS1

iTrader: (24)

Thats kinda what I'm worried about. My y pipe is 3", but necks down to smaller that 3" at the collector (2.5" clamp is too small, 3" is too big. Then, the hooker cat back I pipe is 3", so.....

Mike K.

Maybe you can just get a better y pipe or have one custom made?

DaddySS

There was write up in Hot Rod on installing a small fitting in your exhaust and attaching a pressure guage to determine whether or not you had enough exhaust. I'll see if I can find it.

Jorday

I picked up MPH and ET at the track by going from MACS to LTs and then from a 3 inch I pipe to dual 3s.

The duals will usually make more power than a y pipe setup if you have a crossover and will sound better too. Without a crossover, a y pipe is probably better.

Jordan