Quote:
Originally Posted by Gairloch
Scott I don't know where you're getting your information but the bit about NA engines not responding well to exhaust is incorrect.
Even just a cat back exhaust will result in nice gains, header back results in significant gains on an otherwise stock motor.
It is true that an INTAKE doesn't result in gains unless you've also got other VE (volumetric efficiency) mods such as cams or port/polish.
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I stand by my earlier statement. HP-per-dollar, it's hard to justify the expense of a header-back exhaust upgrade on an otherwise stock engine. There's better money to be spend elsewhere first.
And you're right, maybe I should have been a bit more clear on my earlier statement about hurting performance. I should have simply said that the key to achieving maximum hp in any NA engine is balance. The right exhaust matched to the right cam, matched to the right compression and flow characteristics of the head and intake, matched to the right TB, matched to the right injectors and a properly dyno-tuned ECU managing the ignition and fuel delivery. But the OP wasn't asking for that kind of detail so I didn't give it while I did offer it.
So, I made a blanket statement based on personal experience of too many damn people that slap 3" pipes with a free-flowing muffler on an otherwise stock motor and much to their surprise, they have crap for throttle response and non-existent low end torque. But boy their F-ing engine sounds good!!
Don't accuse me of just pulling stuff out of my butt. I know you know your stuff and by now you should have read enough of my posts to know I'm no moron around a car either.
Scott