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Originally Posted by deuce_454
a 4 stroke engine will always always perform better with less resistance on the exhaust.. the less resistance, the less pumping loss.. if this wasnt the case, no one could sell a cutout...
so on a full length exhaust, especially with mufflers you should go as big as practically possible.. with the added benefit of deeper and better sound.. the only place you should considder a smller diameter is if you run a merge collector...
i have installed a dual 3.5 inch on a 64 skylark with a 400 Hp SB buick. and it was the meanest sounding exhaust ive ever heard... low mean.. rumble,  |
Disagree... It will perform better at the drag strip but not on the street. I have played with baffles in my pipes on my motorcycle. They came with 12 inch baffles which provided gobs of torque but limited top end. I pulled them out and had a ton of high rpm horsepower but a huge loss of low rpm torque. I cut them in half and now have all my torque back and good high rpm performance.
Granted you probably would never know the difference on most of these high horsepower engines we are running but if you were to do a comparison with a good muffler and correct size pipe vs straight exhast I bet you like the drivability of a true system.