Replace Headers with Stock Manifold?
Thread Starter
Safety Car
Joined: Aug 2004
Posts: 3,745
Likes: 5
From: Lakewood WA
Replace Headers with Stock Manifold?
Anyone who has followed my threads knows that I have a built forged LS7 with a YSI A&E supercharger on it along with B&B headers and full catless Akrapovic Ti exhaust. It sounds absolutely wonderful, but it attracts a lot on of attention. This winter I'm thinking of putting the stock exhaust manifolds back on to quiet it down a bit and improve the smell. which is really not that bad, but noticable. I'm currently at about 800 wheel hp which seems to be limited by the spring in my Mondo BOV. At least that is what I think since I have lowered the diameter of the SC pully three times and the boost stays at a max of 12 psi. I'll be pulling that off soon to check it out. So my question is, how much HP do you think I would lose by going to the stock headers?
Safety Car
Joined: Dec 2009
Posts: 4,754
Likes: 303
Le Mans Master
Joined: Dec 2007
Posts: 8,375
Likes: 97
From: Somewhere in the Mid 9's TX
You will blow those cats out fast at your power level, causing the car to lose boost and power. I wouldn't recommend cats at 800rwhp. I blew mine out at 630rwhp within 2000 miles and it screwed the entire powerband of the car up. Had no idea anything was off until it was put on the dyno. I'd put on some more restrictive mufflers that quiet the car down, and then retune it if needed. 
Race Director
Joined: Mar 2007
Posts: 11,331
Likes: 18
From: Missouri City Texas
You will blow those cats out fast at your power level, causing the car to lose boost and power. I wouldn't recommend cats at 800rwhp. I blew mine out at 630rwhp within 2000 miles and it screwed the entire powerband of the car up. Had no idea anything was off until it was put on the dyno. I'd put on some more restrictive mufflers that quiet the car down, and then retune it if needed.
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