Hm Exhaust system Vt

[stevoss]

hey guys regarding the hm exhaust system i am looking at for my car, vt ecotec series 1(single cat) v6 auto, with plans to raptor and convert to manual possibly t56, are these the part number of what i should be ordering was looking to get stainless even if it cost stupidly more.

headers
HM8SS

highflow cats
HM718


cat back system
SS7TIRS

Also has anyone fitted these up themselves?

[Hot-Rod]

Top rang system, will cost you $2500.00 or more for install.

The hi flow cats sit a little lower then the orginal single cat which can scrub on high humps, try and get a dual to rear muffler cat back system, hm is single after middle muffler.

Good system for superchargered future. Enjoy.

[Not_An_Abba_Fan]

If you are going to super charge it, I would fit the Pacemakers as they are bigger primary and secondary than the HM's.

[Hot-Rod]

If you are going to super charge it, I would fit the Pacemakers as they are bigger primary and secondary than the HM's.

I've heard of issues of the pacemarkers rubbing against engine internals due to the larger size pipes. Also it's just a 6 not an 8. Make come into issues of back pressure with the bigger pipes.

[Not_An_Abba_Fan]

You will have less back pressure once you supercharge it because of the larger pipes. I've never had a set of Pacemaker extractors hit anything. The only issue I know of is the VN-VR Y pipe hitting the cross member.

[radarak47]

I have the 1 3/4 inch pacemaker extractors and have no issue with them hitting anything (VX) so you should be ok. I also have twin 2.5 inch high flow cats and again have no issues with them being too low. my twin 2.5 exhaust is dual muffler with a rear resinator and again no issues with them hitting anything.......hmmmmm, maybe I need to lower my car more

[Not_An_Abba_Fan]

You also have a V8 I take it with 1 3/4" primary extractors?

[radarak47]

no the v8 has standard headers at the moment but the rest of the system is identical to the charged 6. FI like free flowing exhausts, NA needs the restriction. Think of it more as how much CFM, if you are drawing in over 1000CFM it don't matter whether it is a 6 or 8 you need an exhaust that is free flowing enough to get rid of the waste gasses.

[stevoss]

does a supercharged system need a unrestrictive like exhaust like a turbo exhaust,i think it would but technically anyone know?

[Tsunamix]

I think I will be going with a single 3.5" system, and an adaptor for a 4" metal cat and a single Resonator. I think the single's sound better. More race. Extractors should be at least 1.5" Primary according the flow reports I saw. As long as the rpimary has the same or greater Cross sectional area as the exhaust port, it will be fine.

yes I'm going Raptor.

[stevoss]

is there any tech info to back up why you chose the 3.5" system???