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<h4 class="dechead">On One Hand: Reviewers Like Flowmaster
Reviews of Flowmaster exhaust systems on consumer review sites like CarReview.com appear mostly positive. After 140 reviews as of January 2010, Flowmaster received an average rating of 4.52 out of a possible five points. Reviewers described the system as "Super nice" and "As advertised," and numerous reviewers claimed that Flowmaster systems increased their cars' power output.
On the Other: Flowmaster Isn't for Everyone
While many reviewers give Flowmaster exhaust systems positive reviews, some actually experienced a reduction in power. According to an explanation of back pressure and exhaust on the Miata.net automotive website, normally aspirated engines require a certain amount of back pressure to maintain optimal operation. When a large Flowmaster system allows exhaust to quickly escape the engine, the vehicle can lose back pressure and produce less power.
Bottom Line
For many users, Flowmaster exhaust systems can work as advertised. Shoppers should exercise caution when selecting a system, though, to ensure that they select properly sized equipment that does not reduce the engine's power.
Source:
CarReviews: Flowmaster 40 Series Reviews
Auto Anything: Flowmaster Products & Reviews
Miata.net: Techno's Know Your Car Series - Back Pressure and Exhaust Velocity
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