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| Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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02-20-2013, 10:39 AM
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#1 |
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Just replacing the stock cats?
How much of the exhaust gains comes from removing / replacing the cats? From what I read they are the largest restriction for the whole exhaust system seems to be the front and secondary cat. If you just replaced these, would that be more cost effective?
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2013 Firestorm FR-S, MTX, build date 1/13.
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02-20-2013, 10:40 AM
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#2 | |
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Quote:
The cats result in a minimal horsepower loss. A lot of the restriction is in the factory header / overpipe / front pipe on this car. After replacing those 3 components, there have been significant gains both on the dyno and the butt dyno. I would plan on keeping one cat unless you enjoy your car sounding like crap. |
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02-20-2013, 11:59 AM
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#3 |
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I would only replace cats with high flow cats, I'd never run catless. Good info though.
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02-20-2013, 08:38 PM
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I replaced the secondary cat with a high flow and have a resonated axle back muffler delete in 2.5" pipe. Definitely mid and top end pulls harder
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07-08-2015, 12:12 PM
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#5 |
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I wanted to revisit this concept as I thought I read somewhere that someone replaced the stock cat with a high flow version and was able generate most of the gains of a aftermarket header (i.e. get rid of the torque dip).
I believe the stock header design isn't bad but the cat is a major restriction. Can someone help me find information on this?
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2013 Firestorm FR-S, MTX, build date 1/13.
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