RE: What pipe to use?
Again, thank you.
I've done some reading on the Macs site that talks about tuning the system. See [link=http://www.macspro.com/tuning.asp]Tuning Information[/link]. I've always assumed (perhaps incorrectly) that you need to attach the whole system (header and pipe) to fine tune the setup. But Macs' instructions are unclear as to whether you should run the header AND pipe or just the header.
My assumption was that you first run the motor with open exhaust and note the RPM. Then you add the header and pipe and run again noting the RPM. Then gradually cut off sections of the header until max RPM is reached.
Are you saying to do this with just the header? Or is running the header open first just to determine the RPM range then add the pipe and continue to adjust for max tuning from that point?
Thanks again.