As some of you know, I have a 79 F150 4x4, 300, 4 speed M/T that I bought for $1K. She runs great, but man, it took a little while to adjust to how flat-out slow it was.

Enter the new Flowmaster Super 44.

Wow. Now granted, my old exhaust was a corroded pipe to a worn out muffler to nothing. Now I have a new pipe to Super 44 (2.25" on both ends) to pipe dumping out at rear wheel. I cannot believe the improvement I got for putting $100 into this thing. Better acceleration off the line, lower cruising RPM's at 60mph and I'm assuming I'm getting better MPG.

A great improvement for us six-shooters!

 

Boo-yah! I felt the same difference!

I went the whole nine yards from manifolds, 2.25-inch tubing, and Flowmaster 40s to Hedmans, 2.5-inch tubing, and bullet mufflers. Took 'er out for a test drive and had a "truck-gasm".

 

Lower cruising rpms with an exhaust change? Explain that one, especially with a 4speed... Is your clutch not slipping as bad as it was before?

 

The engine is now getting the proper back pressure with a proper exhaust system is installed. With all of the leaking from the old exhaust he was wasting performance by lack of back pressure.
With an all-out race vehicle you as much free flow as you can get(but a certain amount of back pressure is still required) but in a street vehicle you need the correct balance of back pressure.

His comments and experience does not surprise me.

 

That myth just simply refuses to die.

http://www.veryuseful.com/mustang/te...Scavenging.pdf

 

Vehicle should maintain the same rpm at the same speeds regardless unless a gearing change was made. Now if he said he had a lower throttle setting at a given speed that would make sense.

 

This is what I was getting at. I don't care if it makes 1hp or 1000hp, if the rest of the drivetrain is unchanged, you will still be running the same rpm at 60mph with a manual trans. Automatic is a slightly different story with T/C slippage.