Went to SpecialtyZ this AM to have new FI HFCs installed replacing my ART Pipes. Seb pointed out that the gaskets were wrong because they were slightly less than 1/4" smaller than the inside diameter of the pipe leaving a black ring around the gasket....restriction! This will cause rasp at high RPMs because it's blocking flow. New HFCs installed I have zero rasp....and no stinky exhaust....Gary

 

big ups for the guys at specialty-z!

 

Nice, were you referring to the old gaskets or the new ones with the HFC's?

 

What brand gaskets were you using, and what did you switch to?

 

The gaskets on SLICK were OE. Only someone like Seb with an eye for the small details would notice a discrepancy like these gaskets being the incorrect inside diameter. I admit I've noticed this before just thought it was normal....live & learn!
Gary

 

Why'd you pull off the art pipes?

 

Yep Sucks because the OE gaskets are nice, but they can't be used if your exhaust uses larger diameter.

 

Just a thought, the exhaust flows one way, if they have black on them, then the gasket was either smaller than the stock headers, or you were looking at the back of the gasket....

 

No headers here MaDMaXX, it's all about the wrong size gaskets. Likely 2.25" ID when they should have been 2.50". Got the right ones now and SLICK sounds great without rasp or stinky exhaust....Gary

 

Headers, part of the exhaust that connects to the head of the engine....

Manifold, many, multiple.

It's all the same, but i'll stop giving you a hard time now, as the community seems to have latched on to the former being nicely bent and flowed with the latter being anything stock/uneven/equal length


Sorry, anyway, interesting, So the OE gaskets were just completely unsuited to the OE pipes? that's pretty bad. Glad it was found and sorted out though, makes the difference

 

But if you don't have headers what connects to our heads are called exhaust manifolds. SLICK'S garage partner (wife's Vette) has headers....Gary

 

That's the terms people are using, yes.

But manifold just refers to the multiple pipes connecting to the head.

 

No one ever called a exhaust manifold headers....ever! (cept you) lmao Manifolds are cast but there's no actual pipes involved. You finally got one thing correct, they're bolted to the head/heads....
Gary

 

The ART pipes sounded terrible above 4K RPMs like someone flushing a toilet and then there's the stinky exhaust. I like rolling with my windows down and pulling up to a stop sign the smell was major f*uckin stinky not worth the 2 or so RWHP ART Pipes add over HFCs....Gary

 

I was just referring to how i see people refer to them on the forums, but remember, they're one in the same. A single cylinder engine will have a header pipe connected to it, a multi cylinder engine will have a manifold of header pipes connected to it

It confused me, but then, so did the term, muffler and resonator, as they're both called silencers in England