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[ltank]

I was looking at Big Twin Thunderheaders. Almost every set is rusty or pipes are very blue from heat. I was thinking about a set for my son. The systems are very long. I was given a rusty set for free that can be bead blasted and ceramic coated. Would they still work ok if the header portion was shortened?

[hawgzilla]

I never thought they worked well even when new.  Huge torque dip and very poor quality.  They seem to have a following but I never understood why.  Just one tuners opinion.

[INDEPENDENT_1]

The early T-Header worked great back when 80" was pretty large motor. Nowadays, there are other pipes that have shown to work better with the 80" now being pretty small. The new X series do seem to be of better quality and they seem to be working better than the early style for larger displacements and the quality seems considerable better. We have a 120R we reworked in the shop now with the X series T-Header that will be spoiled up on the drum soon. As for the torque dip, the infamous "bend the tabs" trick seems to work pretty well for us in the past but we'll soon see if the X series is in need of some tab bending or if it seems to work well as is. I'm confident that we'll get the best out of it one way or another. The T-Header sound is nice IMO if you don't mind loud, boomy/basey toned exhaust pipes.

[ltank]

What is bend the tabs trick? How is it done? Inside muffler?

[INDEPENDENT_1]

Yes, you can bend the tabs you see in your pic to bring the  torque in sooner if you're sure the tune is not holding it back. Its similar to tuning a Supertrapp pipe only a little more primitive, obviously.