I put my stage I GTM SC kit on around 19k miles and currently the car has around 35k miles.
No problems so far other than I have burned through tires faster. I keep up with regular maintenance and check the car out as often as I can to verify everything is working 100%. At the end of the day, your tune and maintenance will determine how well the kit/car last. Does not matter if you drive 5k or 35k a year.
Currently at 400whp.
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