Quote:
Originally Posted by Yaninnya
With all respect but you absolutely wrong. Exhausts with quite low flow drag are often suspect for decreasing torque and power but the real reason is that with far improved exhaust you should remap the DME as after any other mod.
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I'm sorry but you're wrong. The DME has virtually nothing to do with this.
In a well-designed exhaust the pulse of exhaust of one combustion cycle extracts the pulse of the next combustion cycle. Effectively by going to too wide a pipe the resulting flow drag is too low and kills the velocity of the exhaust gases going out the exhaust.