Gas mileage 225 Slant 6

Blainethemono said
Motor trends lil replace the stock exhaust with 2 1/2" pipe added 9 rwhp. I did that & now I dont have any issues merging into freeway traffic.

Making Slant Six Sense

And that's a true better than 10% improvement, how 'bout that? Lol! I know the factory tailpipe on both My '64 GT's were 1.75" & the ID'S were barely 1.5" in the bends, sad really..