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I have used Royal Purple in my 2005 Mustang GT for 13 years. the car had 150,000 miles, heavily modded, Ported and Polished heads, Comp 127-300 Cams, LBA LT Headers, and the list goes on.. The car was a straight line car 12.29 @ 115 in the 1/4 mile and would list the front tire off the ground...