How much gain is a res delete + tubi boxes?

Just curious because I’ve read about some outlandish claims of power gains from these mods on a 456gt. I have the straight pipe res delete and tubi cans. Also, how much would adding hi flow cats gain? And what do they cost? Can’t find much in the way of dyno charts on this car.

 

Huh, I read somewhere there was a direct high flow replacement that was cheaper than oem also. Maybe discontinued.

 

I like the sound, the car does have a drone now but it doesn’t come in until after 3k rpm and that puts you around 90 in top gear so it’s not terrible for speeds under that. It’s not loud at all with this combo, but does have a bit of a growl.

 

Might not look restive but it still is with the perf metal. And there’s a very slight neck that reduces to closer to 2”. It’s barely noticeable. It’s the screen that is causing drag.

 

Maybe a little? I dunno. I also went from K&N to oem air filters at the same time so I might have lost the gains there.

 

I’m tempted to weld a tiny crossover tube like 1/2” or less to see if it quells the drone but I’m afraid it will hurt performance.

 

Interesting. Using two would help stabilize the assembly for sure. Did they do any science type stuff to arrive at that or is it just a shoot from the hip sitch?

 

It seems like it would only take a tiny crossover to kill the drone. Maybe even 1/4” tube or two.