I have a berk exhaust and Cats. My car is pretty low on coils, don't ask me how much because I don't know, but it's pretty low. Exhaust is the first thing besides the front air dam,undertray that will scrape on bumps big driveways. I don't think it really has anything to do with brand of exhaust though, it's just the lowest thing under the car period. I am fine 95% of the time when I am on my 19" wheels, when I throw on my track day 18" wheels though I start to have more problems and have to go painfully slow over the monster speed bumps at work.
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Current Mods: Vorpal Weapon +5.
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