There are electronic cutouts available, they work good. A few of my LS1 buddys have them on their cars. I still prefer to remove the entire exaust system after the headers or just run through the mufflers. A good system wonot slow the car much anyway..

I can get you a link if you really want one.


btw his 99 Z28 runs low 11s with the stock catback and the cutout.. its an awesome sleeper.

 

Back in the 60's my step dad used electric seat motors mounted on the Y to open and close his cut outs. He said when they got really hot they wouldn't close all the way.

 

My dad owns a 89 modded 351C coming out the headers...will about blow your brains out...