Bypass pipes is one of the few things that you can be cheap about.
There is no engineering going in bypass pipes, unlike mufflers, so not many reason to pay an extra! Only reason I see is fitment.
/!\ before buying any bypass pipes, ask the seller to give you the bolt spacing for the flange. Some might only fit if you have headers.
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ASE certified Automotive Master Technician.
Porsche Tech in France.
www.benautodesign.fr
Ben-Auto-Design : Performance parts for 9X6 / 9X7
1982 928 S Euro
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