430 Had to cut new fabspeed headers

I don't know how comfortable I would be having one pipe a different diameter

 

I would have just gone with challenge headers since the OEM headers fit your modified 430 with the supercharger.

 

It's likely very negligible impact. People have done tests denting the crap out of them with no real impact. It's not ideal but I'm sure it's just fine.

 

Wish we lived closer together - I’m a moderately skilled welder and have made many sets of motorcycle/chopper pipes - coulda hooked you up for a beer!

Kevin

 

It is not a critic, just to be clear: as for me it is a job wonderfully done buy I can not stop to look at it like a malformed limb in a wonderful creature.

 

Thread title reads like a knock against fabspeed.

 

The headers should still have the same flow rate with the constriction. As long as the internal area is the same, you should see no difference at all. Many cars have this (see the Maserati GT/Cambio - the stock exhaust does the same thing in order to clear the steering rack).

The main thing is the length. That will affect the sound as the detonation order at the tip depends on the speed of sound and will vary slightly depending on the length of the tubes. You can take a cross-plane engine and make it sound like a flat plane just by modifying the headers. Velocity AP mastered this with the Aston Martin DB cars.

 

Certainly not the same internal area once the tubing is squished. Not likely a huge problem but I think cutting it out and rebuilding as the op is doing is the right way to go. It will barely change the length.

 

Deleted

 

There are plenty of knocks against Fabspeed on this forum. Some well deserved, some not.

 

I used to think dents in the headers would hurt power and be really bad.

But this makes me think otherwise

 

was about to post this. Yes, it's basically a non-problem