Re: 8V Exhaust
Originally Posted by Joammo
What is the safest diameter I can go on the pipe and still keep the motor running?
Exhaust tuning is an art in itself, different bores/paths will create different back pressures which affect the characteristics of the engine. In general a bigger bore will create less back pressure so you will lose torque but it will aid the escape of exhaust gases at higher revs, and a smaller bore will create more back pressure and hence you'll hae more low down torque but it will restrict maximum exhaust gas flow.
I'm not an expert but i believe for road use you will want the smallest bore that doesn't restrict the overall flow of the exhaust gases. If you just go for the largest bore possible you will lose driveability.
As you're only going cat back and not touching the downpipes (crucial to the engine performance) you're already going to be limited by the bore preceding the cat. I would suggest staying as close to the original bore as possible, maybe going slightly larger, but look at keeping the route as free-flowing as possible. The less bends the better, and the shallower the bends the better.
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