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Tilikum Turbo's Avatar
 
Join Date: May 2010
Location: Los Angeles
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Porsche Crest Realistic expectations after installing revised exhaust

I have an 86' basically stock 3.3L turbo, and am going to the simple muffler off the 78-79 non-cat cars(for short-term test purposes only). The car runs 91 octane in So. Cal

I am guessing a 12-15hp bump, but is there any additional torque bump as well that anyone has seen or has been documented on these cars?

Thank you!
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1983 911 3.3L Turbo(YES, I know the turbo badge is on the right...had to be different!)
1996 Toyota Corolla(der 'clapper')
Old 07-05-2011, 02:15 PM
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At best you'll probably get a barely detectable improvement on throttle response- depending on how clogged your cat was. Couldn't tell you hp, but for a point of reference, I got a very noticeable increase in throttle response and 200 to 300 less rpm to reach full boost (1 bar) by replacing a similar setup you have with a rarlyl8 muffler only. Older style muffler can't be that good...
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Old 07-05-2011, 07:38 PM
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Unfortunately there is no difference in performance between the Euro muffler and the USA cat/muffler combo (assuming the cat is in good shape). My mufflers net 12-15WHP when compared to either of the OEM units. Not much I agree but the throttle response , sound, and loosing 30 pounds off the rear add to the improvement.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 07-05-2011, 09:22 PM
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