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Originally Posted by demitri_devarona
Got my 335 about 3 months ago, went ahead and did the mod yesterday and it's great!!
Just unplugged and wrapped one time with electrical tape and pushed it in so it fit snug then wrapped the whole plug. sounds good. no codes.
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Great idea! I'm going to do this one myself. FYI, the reason it's louder on cold start whether or not the flap is open is because the turbo's wastegate is open, allowing the exhaust to bypass the turbo altogether for about 30 seconds or so. When it closes after the initial warmup/fast idle, the exhaust then runs through the turbo, which has a muffling effect. So, even with this simple mod, the exhaust note is going to be somewhat subdued compared to when the wastegate is open.