[DemonWRX]

seems he didn't know

 

[DemonWRX]

That is true....but thermally they will be no worse off than ELH would be. I know that even with ceramic coating and heat wrapping it will not likely be as good with EGT as stock cast iron....I would just like aftermarket UELH considered in a header discussion, and what merits they might have for those of us that like the sound.

 

[DemonWRX]

Aftermarket headers usually spool slower than stock. The idea is to maximize the kinetic energy of the exhaust gases. When you put headers on that flow better, they usually are a larger diameter. Larger diameter means larger volume and slower gas speeds, thus lower KE (for a given RPM).

More flow usually means slower spool, not faster.. unless you're running a massive turbo.

Yes, I realize slower spool comes from larger tubing.....the Borla I was mentioning has 1.625" (outside diameter) primaries and 2.25" (outside diameter) collectors... which if I am not mistaken, are just about the same as stock cast dimensions. The increased flow coming from smooth bends and transitions rather than larger tubing.

 

[DemonWRX]

Anyone know what kind of gains you can realistically get from like Borla UEL headers? They flow more than stock, so they should gain some power, and should gain some spool time too....they sound different from stock as well (deeper thump).

It seems most of the time when comparing EL vs UEL, it is done stock vs aftermarket.....I would like to know aftermarket vs aftermarket personally