Hello, I just picked up a gs430 a few weeks ago and have really enjoyed this forum, I can usually find what I need with a search but I wasn't able to find the intake and exhaust timing ranges, the exhaust port diameter, and the exhaust port w/gasket length? I've decided to build a stainless full header exhaust and want to tune it to what it needs to be, cus after all it should sound like a V8 right? Any help will be appreciated!