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I just recently had the M Performance Power Kit installed. I'm very pleased with the result. I don't have any before and after power, torque or acceleration figures but from seat of pants experience there is a noticeable difference in acceleration.
Mine cost $2,590 AUD all up including fitting. That's not cheap but as I had also purchased the extended warranty insurance when I bought the car, there was no way I was going to go with an aftermarket tuner and thereby potentially void both the original warranty and the extended warranty that I had already paid good money for. For anyone in Australia who has the extended warranty insurance and who is interested to know about coverage of the power kit, I made sure to contact the extended warranty insurer before installing the power kit. Long story short, they eventually provided confirmation that the power kit and any associated mechanical failures that occur during the period of the extended warranty insurance are covered under my policy.
I also contacted my car insurer prior to installation and provided them with details of the kit. They haven't charged me anything extra but they did need to note it on the policy. Again I wanted to make sure I got everything confirmed before proceeding with purchasing the kit.
Interestingly I can't hear any bubbling from the exhaust, even immediately after revving it hard. There is a slightly enhanced sound to the exhaust, perhaps a bit deeper at low revs and louder at high revs, but nothing major. Actually I'm very pleased with that. I was actually afraid prior to installation that the exhaust sound would be too loud for my liking as I prefer to keep the car discreet. Also I got the dealer to leave off the M Performance stickers for the same reason.
The kit took about three weeks to get to the dealer (Germany to Australia) which wasn't a long wait at all. Anyway, for anyone thinking of getting the kit who values their warranty, I think it's worth it.
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