Section 1 catless - shopping list help

[ZStig]

I want to order all the pieces in one shot, am I missing anything?


2x Ar20 resonators
2x 90* 02 bungs
1x normal 02 bung with cap, for future A/F gauge
1x egt bung

I'd also like to buy the flanges and appropriate gaskets, anyone know which ones I need?
The rear o2 sensors might be turned off on the VT2-500 kit, maybe I'm wasting time with the $27 90* bungs

[Beedub]

Originally Posted by ZStig

I want to order all the pieces in one shot, am I missing anything?


2x Ar20 resonators
2x 90* 02 bungs
1x normal 02 bung with cap, for future A/F gauge
1x egt bung

I'd also like to buy the flanges and appropriate gaskets, anyone know which ones I need?
The rear o2 sensors might be turned off on the VT2-500 kit, maybe I'm wasting time with the $27 90* bungs

the rear sensors are active i believe... ive had a CEL when they've gone bad...

[Krypptic]

Go with ar25's. Not for any other reason than it will be easier on the install.

[ZStig]

Originally Posted by Krypptic

Go with ar25's. Not for any other reason than it will be easier on the install.

I thought it was the other way around..

http://www.m3forum.net/m3forum/showthread.php?t=322112

[Gt4]

For your o2 sensors, you can check Vibrant:

http://vibrantperformance.com/catalo...Path=1022_1069

If you need an EGT bung, I have 10 at home. I am selling them $40 shipped each.

[Rated M Roadster]

Originally Posted by Krypptic

Go with ar25's. Not for any other reason than it will be easier on the install.

I used ar20s...

[ZStig]

Originally Posted by Gtfour

For your o2 sensors, you can check Vibrant:

http://vibrantperformance.com/catalo...Path=1022_1069

If you need an EGT bung, I have 10 at home. I am selling them $40 shipped each.

yeah they have their wares on amazon

[ZStig]

Originally Posted by Rated M Roadster

I used ar20s...

same interior dimensions, easier to install. How did your sound change when you replaced your stock section 1?

[Rated M Roadster]

I honestly don't remember exactly how it changed. Probably just louder and the resonators took care of any rasp. It does smell terrible without cats though.

[Krypptic]

Originally Posted by ZStig

I thought it was the other way around..

http://www.m3forum.net/m3forum/showthread.php?t=322112

The facts are correct but my understanding was that it would be easier to weld from 2.25 to a 2.5 opening on the resonator and vice versa than to go from 2.25 down to 2.

At the end of the day, the difference is just the welding and its level of difficulty.

[ZStig]

Originally Posted by Rated M Roadster

I honestly don't remember exactly how it changed. Probably just louder and the resonators took care of any rasp. It does smell terrible without cats though.

hmmm. I guess I'll give it a try, and if the smell is too bad, just re-sell them

[ZStig]

I accidentally found out that you can go with a Magnaflow 10445 which is a bit more expensive, but its also 20" long and reduces a lot more rasp and is quieter. I'm wondering if its too long for our cars...

[DRedman45]

Originally Posted by Krypptic

The facts are correct but my understanding was that it would be easier to weld from 2.25 to a 2.5 opening on the resonator and vice versa than to go from 2.25 down to 2.

At the end of the day, the difference is just the welding and its level of difficulty.

You can cut the tapered area on the ar20's to get it to fit exactly, and you can't with the ar25's

[ZStig]

I'm gonna get under my car tomorrow and see if Magnaflow 10445 will fit. I'd prefer them if they're quieter. Its a sleeper after all

[ZStig]

Taking a chance. I ordered the longer, quieter Magnaflows.

[txz4]

Originally Posted by ZStig

Taking a chance. I ordered the longer, quieter Magnaflows.

Dave is using a single, rather large Ar resonator (cant remember which one) in his single S pipe setup. The volume is certainly there, but overall it had far less drone and less rasp than my euro sec 1+ rpi setup.

I would expect the volume to be WAY passed sleeper levers. I would bet it will sound FAR more motorsport like but with less drone than other options. Just based on my experiences of course.

Please keep us updated on this as it develops. Im looking at doing the same thing with my setup but i havent heard anything definitive as far as whether the resonators will both fit.

[ZStig]

I guess I should have measured first, lol. I'm an impulse buyer. I'm gonna get a better picture about clearance when I hold it up to the stock exhaust anyway

[ZStig]

Got all the pieces, the magnaflows are just as long as the OEM section 1 cats, so they should be able to fit without too drastic of an angle in the piping. Hope the exhaust shop has room in their schedule tomorrow

[ZStig]

installed. Magnaflows didn't fit.

http://www.zpost.com/forums/showthre...2#post14436622

[txz4]

Originally Posted by ZStig

installed. Magnaflows didn't fit.

http://www.zpost.com/forums/showthre...2#post14436622

Interesting, I figured the side to side width of the two would have been the problem, not the length.

If you dont mind me asking, about how much was the bill on that setup? When you test it out, please fill us in on any updates with performance/sound good or bad.

[ZStig]

Originally Posted by txz4

Interesting, I figured the side to side width of the two would have been the problem, not the length.

If you dont mind me asking, about how much was the bill on that setup? When you test it out, please fill us in on any updates with performance/sound good or bad.

Pricing was reasonable, but it cost me a hacked up stock section one which I could have sold for $700

I've ran the car hard, and I feel a nice torque bump above 3000rpm. The car is more fun to drive when on partial throttle at low boost. Sound hardly changed, it didn't get deeper, and there's almost no rasp, just slightly louder at full throttle. I'll record clips

If I can find some reasonably priced flanges, the exhaust guy said he can put together a few of these for around $500, which would include all stainless 2.5" construction with 90* bungs for the rear 02 sensors