Quote:
Originally Posted by ZMan8
Look closely, the car opens throttle partially and revs higher for a little. On cold start I've seen 1400 rpm for 10 seconds before it drops to the 700 rpm idle slowly. The open throttle is what creates the exhaust note. Additionally the cold pipes probably amplify the noise slightly more than warmed up ones.
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ahh.. got ya.. yes.. rev's 1400..then slowly down.. but its the openness of the throttle, coupled with the cold pipes, that gives it that note for that short duration.. thanks ZMan8