Re: What is the best way to tighten exhaust manifold?
If you have aftermarket midpipe, check the connection there, also check to the catback. It can sound like it's coming from the engine but be somewhere else in the system.
Detonation is primarily caused by low quality gas, I believe your Mach required 93 octane so if you've been running anything else detonation could be an issue. It will increase with load on the engine and sound like tapping metal or marbles in a can.
"I'm not driving too fast...just flying too low"
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
90 7up vert - new project-07 DSG Focus -DD