What to Buy
The following table contains the best of each type of those mufflers tested. As can be seen, a straight-thru design gives easily the best mix of noise suppression and flow.
||Suzuki static noise
||Cobra static noise
||Seca static noise
||Seca full-load noise
||Walker Lukey L0099
Unless you need to fit a muffler just so that you can pass a noise test, steer clear of baffled mufflers - their flow is typically only about half that of a same length piece of empty pipe. Tri-flow (reverse flow or ?turbo? mufflers) also typically flow badly - even a good one only has about 70 per cent of the flow of an empty pipe. However, tri-flow designs can be significantly quieter (but not always!) than straight-through designs. Tri-flows can also have a deeper, mellower sound. A good dogleg muffler gives a very pleasing note, together with adequate flow and noise reduction.
The best bet then is a straight-through muffler. If used in conjunction with a cat converter and good resonator (or simply a second straight-through muffler), you will have a system that definitely has excellent flow and very probably has a good quality, quiet sound. The latter unfortunately can't be guaranteed - too many other factors determine the actual noise output.
Our recommendations are:
Exhaust Technology M 14614.
Genie stainless steel resonator.
08 8272 7500
08 8277 3927
F&M Cylinder Heads
08 8294 2515
Morphett Vale Exhausts
Giant Muffler Comparison - The Mufflers!
Giant Muffler Comparison - Testing Procedures
Giant Muffler Comparison - Detailed Test Results
08 8384 6400