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Craig- Dean is talking exhaust / sidepipe. That is a pic of a cut sidepipe he is holding and it shows the 2" inner core.
You can remove the baffles in the SPF pipes.......but they get pretty LOUD.
You can also get some SS pipes in either 2 1/4 or 2 1/2 inner cores. The bigger the cores the larger the HP.
The SPF headers are 1 3/4". You can get larger headers, but keep in mind that too large a header tube can cost you TQ. I probably wouldn't go over 2" headers if I were buying new.
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