whats the best sort of design with them
smalest diameter pipe you can get away with, without restricting it??
or am i thinking wrong??

just wanna try and work out what i need to replace the current heap
on my 205 16v.

any info on designs/theory would be great thanks

 

Do a net search as there are formulas for best performance.
tabetha

 

one of my friends contact richard longman racing for advice on his Mi and they stated that 2 and a quarter inch is best for high powered NA cars.

 

thanks guys