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Originally Posted by Plums
For the minimal impact cats have on performance I think it's wise to run them. They do act as a muffler too, taking some of the "raspiness" out of the exhaust note, which to me is a bonus.
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This was also mentioned over on one of the bowtie threads. In my experience with other guys, cats tend to 'mash' the noise and really help in achieving an acceptable level in side pipes.
Compression though is a real noise maker, and its difficult to quiten the 'bark' of a hi comp engine.
PhilM, is your new engine higher compression than previous?