Best option for headers + cats

[0-60motorsports]

2 cats = 480bhp

From HJS directly:



M5 guys out this combo on the map. Check this forum post out for additional info

https://www.m5board.com/threads/hjs-...erters.192808/

Seems like the HJS distributor in the States are Fabspeed now. I emailed them a few days ago but havent heard anything back. Hopefully they reply back soon so I can see if its better/less of a headache to buy the cats to weld in or get a new set of catted pipes from SS.

[TosM3]

Some kid on Instagram just discovered a Japanese tuner who realized the e46 m3 exhaust is "unequal". They made a section 1 with an unequal pipe layout to compensate for this difference in exhaust length in the headers to smooth out the s54 sound.

https://sunbeam8store.com/en-us/collections/e46m3/products/racing-front-pipe-for-e46m3

@jjjaacoobbb Instagram

My friend sent this to me it sounds nice but there wasnt evidence of hp gains.

[0-60motorsports]

Saclam headers look amazing!

[usdmej]

Holy moly had no idea no idea Saclam made exhausts for our platform.


Supersprint is nothing compared to what these folks can produce

[Tbonem3]

So just looking at it, I think I'd call that sect 1, "unequal" length. Which I assume is done to make up for bank 2 headers being further back than bank 1 (cyl 1-3).

[Stilt]

Another company sells something similar too, if you are looking for options.

https://www.saclam.com/products/lpho...ross_pipe.html


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This same company (Saclam) has equal length headers as well but are very pricey.



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[Stilt]

Another company sells something similar too, if you are looking for options.

https://www.saclam.com/products/lpho...ross_pipe.html


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[Stilt]

This looks great! What company is this?

TK-Square, here is the link:

https://www.tk-square.jp/products/e46_m3_exhaust/

You may have to email them about buying the sec 1 individually because on their site it seems they sell a package, of several different sections.


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[Gearhead55]

Sunbeam isn't the first company to make the equal length sec 1. They have been out there for some time. There is another company who, from the translated version, appears to make a similar design with cats. But I don't see the product on their site anymore.

This looks great! What company is this?

[Stilt]

Those are resonators in that piece, not cats, unfortunately. If they produced that with cats I would buy one immediately.

Sunbeam isn't the first company to make the equal length sec 1. They have been out there for some time. There is another company who, from the translated version, appears to make a similar design with cats. But I don't see the product on their site anymore.


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[dukeofchen]

I must have given off narc vibes because the last smog guy inspected my car for at least 10 minutes. Probably didn't help that it was mid-day and nobody else was there.

[AWE46M3]

interesting. Those cats say good for up to 240bhp.

2 cats = 480bhp

From HJS directly:



M5 guys out this combo on the map. Check this forum post out for additional info

https://www.m5board.com/threads/hjs-...erters.192808/

[spooni]

Ken from Sunbeam will make a version of the Section 1 with no resonators. Weld in your own HJS cats and enjoy - HJS part no. 90 95 0092

@OP - in lieu of euro cats, you could do this mod to your OEM Section 1 and pair them with a used set of OEM euro headers. DIY Super Sprint catted section 1 for half the price.

Picture credit and HJS Cats part number identification thanks to MarcoPolo

interesting. Those cats say good for up to 240bhp.

[AWE46M3]

Ken from Sunbeam will make a version of the Section 1 with no resonators. Weld in your own HJS cats and enjoy - HJS part no. 90 95 0092

@OP - in lieu of euro cats, you could do this mod to your OEM Section 1 and pair them with a used set of OEM euro headers. DIY Super Sprint catted section 1 for half the price.

Picture credit and HJS Cats part number identification thanks to MarcoPolo

[usdmej]

I have never once had a smog tech get down and check under the car for cats.

I'm sure it's happened, but I wouldn't worry too much about it.

for me it happens about 50% of the time. the euro cats always pass because well, they're literally factory parts. i'd imagine aftermarket cats would look like resonators to most tho.
you'd have to get really unlucky to have a smog tech that knows specifically where usdm E46 M3 headers should be located and fail you based on that.