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Clean the thread with a tap. Don't risk it. Bolt can easily gall in aluminium

Yep, there abouts. It's pretty lazy on 98 compared to e85, but it's super safe, and still turns the 275 Nitto NT05s on the back. I actually got two low boost tunes too. It makes 320rwkw on 10psi 98 and 370rwkw on 12psi e85. Plenum makes it breath a lot better, but I think it's pushed boost threshold up around 200rpm. The tuner said this was one of those cars where everything seems to come together well to make power with modest boost. I guess that's what you aim for hey

If you think it's a spring leaf problem, jack the car up prise the leafs apart & jam some plastic sheet in there & take it for a drive to see if the noise alters. At least you narrowed it down to what side it is!

Ha ha I drove from Hobart to Sydney to have Joe at Hoontune, tune my car. 40 min to have Mick (Pitlane) work on your car doesn't seem like a problem to me