The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Magnaflow XL mufflers

djgebert · 04-29-2014, 09:16 AM

A lot depends on your engine. CC69Rat is correct, it may be a backpressure issue. 2.5" exhaust was not designed for non-performance engines, they need some back pressure to run at their best do to lower compression and cam profiles. Do you know what engine and compression you have? You may need to go to a more restrictive muffler if you have a fairly low compression engine. If you are running 10:0-1 or higher compression, there shouldn't be a power loss issue, it should have actually improved performance.

04-29-2014, 09:16 AM	#4
djgebert Registered User Join Date: Jan 2008 Location: Fort Wayne, Indiana Posts: 197	Re: Magnaflow XL mufflers - yay or nay? A lot depends on your engine. CC69Rat is correct, it may be a backpressure issue. 2.5" exhaust was not designed for non-performance engines, they need some back pressure to run at their best do to lower compression and cam profiles. Do you know what engine and compression you have? You may need to go to a more restrictive muffler if you have a fairly low compression engine. If you are running 10:0-1 or higher compression, there shouldn't be a power loss issue, it should have actually improved performance.