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for the 172 - cat back ONLY, or full system inc decat
back box is your choice
stealth - quiet
race - loud
sport - just as loud
they're all interchangable, so if the race system is too loud day to day you can buy the stealth backbox at a later date, 2 bolts to change over, takes 5min!
we never power tested the stealth as it wasn't designed for performance, BUT jamsport tested it (independantly might i add) with matched inlets before and after i believe they saw 7-10bhp gain possibly including a decat, but speak to brooster and he'll tell you what it had
If you're looking for standard sound - Yozza stealth FTW. I have one and I absolutely love it. It's whisper quiet when you're cruising or tootling round town, so there's no need to feel embarrassed or wear a baseball cap . When you open the taps it has a beautiful rasp.
Definitely Kev. The K-Tec got sold to someone with partial deafness . I remember all your posts from a while back about the noise and embarracement surounding the K-Tec stealth - you echoed all my exact feelings about it. Based on that I thoroughly recommend a Yozza stealth for you - its just in a different league compared to the k-tec and beats it hands down in terms of sound, build quality and ease of fitting. Its exactly what I wanted from an exhaust and probably what you would like also.