Reply to "180's"

panteradougMember

I'm pretty sure mine are ~~3-1/2"~~ 3".

I think this is really a subject of tuning. Everything in the system is "adjustable" to put the most power in a range where it can be used the best.

What is best for YOUR ENGINE, or mine is not the same as someone elses. Not everything is equal and not everything can be generalized.

There are other things that can be used in the exhaust such as step tube primaries for one thing. They are just as effective in changing power curve as anything else is.

Another factor is aftermarket "high port" heads AND some use 1.60" exhaust valves and some use the 1.71" exhaust valves. That is involved in deciding what diameter primary tubes get used.

Why worry unless you are going to run at Lemans?

The "engineers" here among us just want the challenge.

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