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598nos
09-11-2008, 06:43 PM
Do you have to run a muffler in HEAVY STREET? 598 on NOS.
thank you.
DaleJr67ProStreet
09-12-2008, 09:43 AM
All combinations run mufflers, except turbo cars.
another69camaro
09-14-2008, 11:38 AM
borla xr1s are ok.