I have a 77 280Z with a 355 Chevy and T5 set up. I am currently running Patriot sidepipes on the car. The engine has a mild cam (Comp 270H grind) so it has a noticeable idle. The car is in the garage to get the body work done this winter. I had to move it the other day with out the side pipes hooked up and MAN! what a different sounding engine ( and no, not just louder!). The lopey idle became very noticeable with just the headers and about a 1' section of tubing. When the side pipes are on the cam is no where near as distinct.
Finally my question: If I replace the approximately 3' long straight thru muffler in the side pipes with a shorter one, keeping the diameter the same (3") will this help the sound of the idle to be more noticeable? or is it strictly related to the length of the pipe and changing the muffler length will not have any affect?
Thanks to all who reply.