Supersprint & SCZA 2.5" System w/ Mods

[Apex_80]

Nice, you got it right from the beginning. I'm still keen to play with section 3. I was surprised how quiet it ended up with SS resonated section 2 and the SCZA.

I wish I could say that was my first exhaust setup but I've done a bunch. My favorite sound wise was the Rogue El diablo, but the combination of the 2.25" piping and the harsh bend on one of the pipes really hurt power. I'm not sure what other section 3's there are out there that would provide a better not and not completely dominate the airbox.

[jbfrancis3]

I have effectively the same system on my car. SSV1/ 2.5" section 1 with HJS/ 2.5" section 2 resonated and an old "Oakville" SCZA. Great exhaust for airbox noise. I made 360whp on a dynojet, also have 280/272 cams

Nice, you got it right from the beginning. I'm still keen to play with section 3. I was surprised how quiet it ended up with SS resonated section 2 and the SCZA.

[Apex_80]

I have effectively the same system on my car. SSV1/ 2.5" section 1 with HJS/ 2.5" section 2 resonated and an old "Oakville" SCZA. Great exhaust for airbox noise. I made 360whp on a dynojet, also have 280/272 cams

[Cubieman]

It decreases power, decreases fuel efficiency, and, for reasons beyond my understanding, is worse for race cats.
(when I installed the SS/HJS race cats on my car, I called HJS to ask them what would be a good temperature to set the enrichment point to-- they told me it was only worse for their cats and to turn it off completely)

Got it, never would have guessed that.

[Obioban]

Why disable enrichment race cats or not?

It decreases power, decreases fuel efficiency, and, for reasons beyond my understanding, is worse for race cats.
(when I installed the SS/HJS race cats on my car, I called HJS to ask them what would be a good temperature to set the enrichment point to-- they told me it was only worse for their cats and to turn it off completely)

[Cubieman]

You might be underestimating exhaust temps. IIRC the stock cat protection via enrichment (which many, including me, disable, once they go race cats/cat delete) kicks on ~900°.

Why disable enrichment race cats or not?

[Obioban]

I’ve observed the system extends 1/4 to 1/2” inch doing a visual on the tips. And a quick look at the coefficient of expansion for stainless indicates a 3 meter length should grow 15mm over 300C delta (a guesstimate for the average increase).

Probably what I’m missing is I’m just doing street driving. Perhaps during track driving that temp delta is higher.

You might be underestimating exhaust temps. IIRC the stock cat protection via enrichment (which many, including me, disable, once they go race cats/cat delete) kicks on ~900°.

[jbfrancis3]

I’ve observed the system extends 1/4 to 1/2” inch doing a visual on the tips. And a quick look at the coefficient of expansion for stainless indicates a 3 meter length should grow 15mm over 300C delta (a guesstimate for the average increase).

Probably what I’m missing is I’m just doing street driving. Perhaps during track driving that temp delta is higher.

[stash1]

Tough pill for sure. Even more egregious if they're galvanized, which is what Rogue's site suggests by noting prone to rusting.

These brackets weren't on my vehicle when I purchased, hence the mistake of just replacing the mounts. Besides maybe keeping some of the lateral movement at bay, which could reduce the stress, I don't understand how the added brackets have a meaningful effect. Its not like the brackets provide any droop support.

Does anyone know why the factory mounts are so elaborate? They appear designed to take a lot of movement. Rogue's mounts (which I'm committed to trying) eliminate it.

Lots of expansion over the length of header to muffler when things get very hot?

Ya, that, and I would imagine that the metal just simply provides support to the rubber portion (so as not to over extend/deflect)...similar (to a lesser degree) to any suspension joint where the metal housing encapsulates the softer bushing inside.

[Obioban]

Tough pill for sure. Even more egregious if they're galvanized, which is what Rogue's site suggests by noting prone to rusting.

These brackets weren't on my vehicle when I purchased, hence the mistake of just replacing the mounts. Besides maybe keeping some of the lateral movement at bay, which could reduce the stress, I don't understand how the added brackets have a meaningful effect. Its not like the brackets provide any droop support.

Does anyone know why the factory mounts are so elaborate? They appear designed to take a lot of movement. Rogue's mounts (which I'm committed to trying) eliminate it.

Lots of expansion over the length of header to muffler when things get very hot?

[jbfrancis3]

Yikes, $58 for a shitty stamped metal bracket-lol.

Tough pill for sure. Even more egregious if they're galvanized, which is what Rogue's site suggests by noting prone to rusting.

These brackets weren't on my vehicle when I purchased, hence the mistake of just replacing the mounts. Besides maybe keeping some of the lateral movement at bay, which could reduce the stress, I don't understand how the added brackets have a meaningful effect. Its not like the brackets provide any droop support.

Does anyone know why the factory mounts are so elaborate? They appear designed to take a lot of movement. Rogue's mounts (which I'm committed to trying) eliminate it.

[stash1]

prob dime a dozen on fleabay

Ya, think I def try to source some used ones for cheaper.

[Tbonem3]

prob dime a dozen on fleabay

[stash1]

I didn't fully comprehend Slideway's comments - now I get it. You mean this, separate bracket
https://www.ecstuning.com/b-genuine-...h/18207839657/

Yikes, $58 for a shitty stamped metal bracket-lol.

[jet_dogg]

It's crazy how much information is lost over the years when these cars change hands and POs rig things without subsequent owners knowing.

These exhaust mounts are notorious for tearing and yes it's a two part system.