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Size matters
Dear Sirs,
yes right and there is a clear tendency of thinking bigger is better.
This is not the case - you can see the majority of exhaust tubing being oversized.
A lot of the people doing this systems are reasonable welders but far away of being exhaust experts or constructors.
The Porsche engines like relatively small tubes - as an example a 45x1 mm tube is good for 400 plus hp out of a full spec 3,5 l RSR style race engine with 50 mm flat slides.
Max power is at 8.600 rpm and shifting is at 8.800 to 9.000.
So a bigger tube is not automatically making more peak power - it can also mean loosing everywhere.
Same with the ports - work at the seat / bowl area but do not open it up too much.
Ports also tend being too big not being too small !
Best reg.
Dirk
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