Do I have enough exhaust?
Do I have enough exhaust? 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
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Do I have enough exhaust? 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.
Re: Do I have enough exhaust? 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.....
Then, the hooker cat back I pipe is 3", so..... 
TECH Addict
Joined: Dec 2001
Posts: 2,907
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From: Bergen County, NJ
Re: Do I have enough exhaust? 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.
10 Second Club
Joined: Nov 2001
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From: Fenton, MI
Re: Do I have enough exhaust? 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
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
