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Okay guys did this mod today as well. Muffler shop preferred to weld as they thought the clamps might not stand up to the heat.
I still have the stock n55 downpipe but this sounds absolutely amazing. Wife couldn't tell any difference when just cruising at 65. Under load though at 3-6k tpms sounds glorious. The videos are exactly how it sounds to me inside with stock intake and the windows down.
I can't see spending $800-1000 on a cat back that will sound no better but will probably drone.
If you think it's too loud you can wrap the flapper pipe with the three holes. This will magnify the effect of the flapper since that pipe will be a straight pipe now instead of a less muffled pipe like now.
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