ok starting from basics,
at first i had straight through piping (2 1/4) from the cat all the way back to the twin mufflers, in essence taking out the two central mufflers. however, i had alot of high pitch noise and it made the car sound like a hyundai. so i had a high-flow hotdog resonator put in closely after the cat convertor, (just a generic brand) that got rid of the high freq whine and kept it fairly quiet at low revs (only slighty more noise above 5000 than stock).
i then installed K&N typhoon CAI (only short ram for now, will install full piping closer to summer when i have more time). no real sound level difference for normal driving (slightly more airry sound) and you can definately hear the difference when vtec kicks in (awesome sucking sound). but as you put your foot down and the throttle body opens wide, you get a very nice loud destinctive low grumble (almost like a wrx). sounds very nice around the 4-7000rpm range.
im getting the car dyno'd on the 22nd july, so ill let you know how that goes once i have results.
i have picture of the set up here, and i will try to get sound clip for you guys aswell
cheers
FYI - K&N kit extremely easy to install! probably a 15min job, anyone could do it
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