My First Ever Project Build.

[craigF]

I've always thought this would be one of those most hard jobs to take on.



If you don't mind explaining, what was his reasoning behind the reduction in size after the collector then taper back out?

I did wonder the same thing after your question. Asked the exhaust man why not go straight to a 3" collector instead of going out to a 3". He said it enables a small pressure build up and act like a venturi pushing the gases out under that little bit of pressure clearing the headers better. He makes them this way after lots of testing on the Touring Car Masters cars down here in Australia. How true that is will be on the Dyno i suppose. Sounds a good in theory though.
Saw him yesterday and he is going to go around the outside of the shocks on the rear in line with the rear rails and make the pipe over the axle oval keeping the same volume area but giving clearance for the suspension travel.
Craig.