Have any of you tried this.Just wondering if there are any ill effects?I'd like the rpm's to drop faster, but don't want to screw something up

 

https://mustangforums.com/m_3233880/tm.htm

 

I've tried it, changed it, and removed it. I liked it at first but after driving with it I didn't like how it was putting a lot more strain on the engine when you remove your foot from the gas. I'm back to stock gasket now. But its usally different for most people. Really easy to do, you should try it if you would like.