Section 1 that's both catted and resonated?

[LSB4Me]

These look great. The cats themselves serve as resonators I believe but this would perfectly compliment them.

Ok, cool. I’m game to try them. Does anyone have a spare Section 1 sitting around? I would be interested to know the length of the rear straight section—meaning, the portion after the kink and before the flange.

The little resonators above should fit without issue, but I would like to confirm before undertaking the project.

if this works, it will make for an easy way to replicate the Euro200R based on currently available parts. Maybe I can have my exhaust guy make up a bunch of them if there are enough interested members.

[Vonbimmer]

Thanks for sharing the resonator info. I’ve been interested something that could be added to my SS catted section 1 to help tame some rasp so I’ll be looking at the fit potential too.

[Tbonem3]

More resonators = more boring exhaust note fyi. But perhaps some want that 🤷♂️

[heinzboehmer]

Does anyone have a spare Section 1 sitting around? I would be interested to know the length of the rear straight section—meaning, the portion after the kink and before the flange.

A: 13.5"
B (distance between centers of pipes): 5"

Hope that helps

[EthanolTurbo]

A: 13.5"
B (distance between centers of pipes): 5"

Hope that helps

I think he meant this part

[LSB4Me]

A: 13.5"
B (distance between centers of pipes): 5"

Hope that helps

Thank you! I need to check the location of my cats, but I believe they are in the location that you measured. Would you mind measuring the rear portion of your Section 1 (after the kink) so we have that too?

EthanolTurbo is correct — I was initially focused on the rear portion as that is where I believe the squatty resonators will go.

Tbonem3 — Do you know where the cats are in the German eBay Section 1?

[heinzboehmer]

Oh my bad. Read "rear straight section" and assumed it was that part. Would make sense that the necessary measurements are for the other bit, just didn't give it too much thought.

I'll grab those measurements tomorrow

[Tbonem3]

Max, I think you're looking at sect 1 backwards. The straight sections are immediately after the headers. Cats in sect 1, like euro or ebay piece or SS, are always in the latter portion before sect 2 (makes more power farther back). Just like the single resonator is on u.s. cars.

CPI even put both cats and resonators together, despite the lack of real estate (to hold both), in that latter portion, if memory serves.

There's also the matter of clearance from body. Earlier portion has less room. The pipes are also too close together there (versus the "B" that Heinz measured)

[heinzboehmer]

Thank you! I need to check the location of my cats, but I believe they are in the location that you measured. Would you mind measuring the rear portion of your Section 1 (after the kink) so we have that too?

C: 10.5"
D (distance between centers): 4"
E: 8"
F: 7"
G (distance between centers): 4"
H: 8"

Those resonators you linked are 6.5" long and 4" in diameter, so should just barely work if you put them in sections C and E.

[Tbonem3]

I don't know Max, I think I'd embrace the bit of rasp that these cars do naturally have. Or maybe a different sect 3 would help a bit?

OR, could you buy HJS/GESI cats and have them welded in place of the cheap cats, as I agree, that's the issue, not to mention smell. Being in or so close to LA county makes it even sketchier rocking those cheap cats on city street. They must barely pass the emmission monitors, but might cause the smog tech to say "no way Jose."

[LSB4Me]

C: 10.5"
D (distance between centers): 4"
E: 8"
F: 7"
G (distance between centers): 4"
H: 8"

Those resonators you linked are 6.5" long and 4" in diameter, so should just barely work if you put them in sections C and E.

Thanks so much for this. I think I can sneak one--perhaps two--resonators into the C/E section, provided the body work and heat shields allow it. Then again, I am finding that the rasp goes away as everything heats up and that rasp increased with the addition of an Evolve airbox. I might just swap to a euro section 1 if/when one of those pops up. The beefier cats should cut down on everything and yield an improvement across the board.

Tbonem3 -- You are absolutely right, Tyler. I am running a stock Section 3 with a resonated SS section 2 (the narrow one; not the 63.5mm), so not much help to be realized there. Regarding fumes, the car smells infinitely better than my old, carbureted 911 with zero smog equipment--because pre-74 smog exempt. Of course, I don't want to get dinged so a euro section 1 is on the wish list.

[dukeofchen]

CPI did a group buy like 8 years ago with ss decat pipes and 2 x magnaflow 200 cell welded in for use with ssv1s. I had a set. They sucked. Smell isn't much better, flow isn't like hjs.

Interesting, I would have thought CARB-approved units would be good enough to at least help with smell. Sounds like then the standards are somewhat BS in this area, and more an impediment to all companies that aren't willing to invest in the testing required to get CARB.

But I suppose if it's what it takes to run aftermarket exhaust and have a chance of passing a visual test, there aren't many other options outside of the Euro setup.

[LSB4Me]

Interesting, I would have thought CARB-approved units would be good enough to at least help with smell. Sounds like then the standards are somewhat BS in this area, and more an impediment to all companies that aren't willing to invest in the testing required to get CARB.

But I suppose if it's what it takes to run aftermarket exhaust and have a chance of passing a visual test, there aren't many other options outside of the Euro setup.

Although every test/facility/operator/circumstance is different, I am least worried about the visual check . . . airbox notwithstanding.

While nobody wants to be sent to the ref, I respectfully dare the tech to tell me the cats on an e46 M3 aren't contained in the section 1 exhaust pipe. Even still, if my stock cats fail, could I not then add more cats to the system, seeing as the stock cats are obnoxiously located in the headers (a component that is expensive to source and replace)? I think there are a number of solid arguments to be made re cats and do not think that it would be fair to assume that you would automatically be sent to the ref so long as things don't turn ugly.

FWIW, I would think that a euro section 1 would not fair any better against a stickler-of-a-tech. Not original smog equipment = fail.

[dukeofchen]

Although every test/facility/operator/circumstance is different, I am least worried about the visual check . . . airbox notwithstanding.

While nobody wants to be sent to the ref, I respectfully dare the tech to tell me the cats on an e46 M3 aren't contained in the section 1 exhaust pipe. Even still, if my stock cats fail, could I not then add more cats to the system, seeing as the stock cats are obnoxiously located in the headers (a component that is expensive to source and replace)? I think there are a number of solid arguments to be made re cats and do not think that it would be fair to assume that you would automatically be sent to the ref so long as things don't turn ugly.

FWIW, I would think that a euro section 1 would not fair any better against a stickler-of-a-tech. Not original smog equipment = fail.

Yeah I think this highlights the flaw in the system. For aging cars with high mileage that are still subject to these requirements, cat performance will inevitably degrade against the desired performance and replacements would be better for the intent of the regs.

But the rules are so restrictive that approved aftermarket options are not readily available, and may even result in a fail depending on the tech.

[Tbonem3]

You are absolutely right, Tyler. I am running a stock Section 3 with a resonated SS section 2 (the narrow one; not the 63.5mm), so not much help to be realized there. Regarding fumes, the car smells infinitely better than my old, carbureted 911 with zero smog equipment--because pre-74 smog exempt. Of course, I don't want to get dinged so a euro section 1 is on the wish list.

Ah, I thought you had the new SS res sect 2, which I think does tame rasp pretty well (the unres version killed all of my rasp when I tried it).

Though, traditionally, the older SS "x" pipe (really a double Y pipe) ARE supposed to kill rasp and change the sound in (to most) a pleasant way. So now I'm thinking you're hearing the rasp literally eminating from the midpipes, which I too experienced badly when I installed some cheap, catless 2.5" ebay pipes (manzo).

I really really think, for multiple reasons, you should keep the decent german ebay sect 1 you have since it's of decent construction and 2.5" piping, and have some HJS 200cell (more expensive) or GESI 300 cell (less expensive) cats welded in and not bother with more resonators. Partly it's my suggestion because it already has o2 bungs for emissions (iirc)

Or sell the sect 1, and not even lose $, and pony up for the Supersprint HJS one - you will not be disappointed. Or you can ride in my car, though I have the stepped version of things (2.5")

I can't wait to go back to stock sect 3, even though I love the scorza. I think stock sounds so good actually. You should hear Andre's bone stock (just eventuri) Carbon black E46 - it sounds so damn good it's always a nice reminder. His is a factory freak or something though. Sounds like it's running on 100 octane with cams blah blah, strange. Even a E92 M3 guy we ran with in the canyons said Andre's stock E46 sounded better than a few of our highly modified ones lol.

And once you have the airbox, you'll be glad to have a large bodied muffler, if you can fix this unpleasent midpipe sound.