Quote:
Originally Posted by LBbluem2
I'll probably just put my valves back to normal, that was perfect.
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☝🏻Thats the move. Alot of these new mufflers are straight through in the valves open position to compensate for all the upstream restriction. I have long tube catted headers on my 718 spyder mated to the stock muffler and valves disconncted is brain splitting, whereas valves connected is silky smooth with zero point zero drone followed by race car around 4k rpm. The only downside is the volume transition but its a small price to pay for driveability IMHO. Just for clarity u are running the stock muffler right?