
I'm actually studying a 300 bhp engine setup



I actually run without cats





May i face a power limiting factor



Do you know if there's any other flow bottleneck in the stock exhaust system?

Regards


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Not sure on the diameter but would think 2.5 or 2.75 all the way through would be fine.Larger is just a waste and noisier at those power levels.
Al-sw20 wrote:The inlet to the stock muffler is a restriction as well.If you are prepared to open up the stock muffler and replace the factory inlet with a 3" pipe, it really frees it up.