[F90jay]

What is the Akrapovic, Eventuri tier equivalent for S58 downpipes?

[evidence]

Originally Posted by F90jay

What is the Akrapovic, Eventuri tier equivalent for S58 downpipes?

Pretty much all the same stuff, just get one w a flex section that has a history of good quality control and the style you want. No cat, 200 cell, GE$I.

Maybe a fat boy if you plan to get real srs.

[mike@x-ph.com]

Define best.

If you want a downpipe with no CEL, the active autowerke is the best.

If you are looking for the best finish and quality, Akrapovic is the best. Evolution Racewerks is second.

Power is almost identical in all of them.

[Info@mad-us.com]

We make the largest downpipe at 3.5'' vs the typical 3 inch.

Best in flow would go to the MAD fatboy downpipe.

[TopJimmy]

Pipes is pipes…as long as they fit.

Mike gives solid recommendations and great prices (just ASK!). That’s why I buy from X-PH.

[Jasinedward]

Originally Posted by Info@mad-us.com

We make the largest downpipe at 3.5'' vs the typical 3 inch.

Best in flow would go to the MAD fatboy downpipe.

This is what I just had installed.... Price was excellent and quality is great! I still don't understand why people feel the need to pay thousands for cat deletes?

I was also really surprised at the sound quality as well. I was expecting it to be quite a bit louder, but it's only a little louder, with nice tone when in M mode. It was a pleasant surprise. Also.... with these downpipes and a stage 2 e50 OTS map I ran a 10.1 at 133....

[mike@x-ph.com]

Originally Posted by TopJimmy

Pipes is pipes…as long as they fit.

Mike gives solid recommendations and great prices (just ASK!). That’s why I buy from X-PH.

It's a pleasure to receive positive feedback from an experienced forum member like yourself. Thank you!

[Info@mad-us.com]

[QUOTE]=Jasinedward;31148962]This is what I just had installed.... Price was excellent and quality is great! I still don't understand why people feel the need to pay thousands for cat deletes?

I was also really surprised at the sound quality as well. I was expecting it to be quite a bit louder, but it's only a little louder, with nice tone when in M mode. It was a pleasant surprise. Also.... with these downpipes and a stage 2 e50 OTS map I ran a 10.1 at 133....[/QUOTE

[tom @ eas]

Originally Posted by F90jay

What is the Akrapovic, Eventuri tier equivalent for S58 downpipes?

A lot of people confuse this question of who has the best, usually ends up turning into who has the cheapest downpipes.

Akrapovic sets the bar for quality. No one can compete with their manufacturing or materials, and the price reflects it. The brand is world-recognized, even by BMW.

You didn't mention if you were looking for catless or catted DPs, Akrapovic US does not import the catless version, so you are left with catted only (200cpsi). If you want cheaper, there are all sorts of options, but cheaper doesn't mean a better deal in all cases as a lot of the brands are manufactured overseas with cheap materials, copied designs and/or subpar fitment - you tend to get what you pay for. Some get lucky, some are not so lucky. It all comes down to what your time is work, as most shops will still charge for installation if you brought your own parts. We've got our favorites here we like to install and usually we carry these brands - there's other brands that simply know is going to be a PITA to fit and we'll warn the customer up front.

If not opting for the Akrapovic pieces, we like the Evolution Racewerks Sport Series High-Flow Catted Downpipes. These are T304 Stainless, TIG welded, have high flow 200cpsi cats and are manufactured right here in the US. You can get then in brushed, polished or even hi-temp black thermal coated finish. This is what we install here, we know the ER guys for years and installed their products on customers (and our own) vehicles, including those on the track. The ER pieces are essentially bulletproof, so they can take the abuse. ER offers a non-catted version also.

If going the Akrapovic or ER route, you won't have anything to worry about. Feel free to PM me if you have any questions, I'm happy to help.

[Xanston]

Originally Posted by Jasinedward

This is what I just had installed.... Price was excellent and quality is great! I still don't understand why people feel the need to pay thousands for cat deletes?

I was also really surprised at the sound quality as well. I was expecting it to be quite a bit louder, but it's only a little louder, with nice tone when in M mode. It was a pleasant surprise. Also.... with these downpipes and a stage 2 e50 OTS map I ran a 10.1 at 133....

Does the OTS tune get rid of the CEL from the down pipes? I’m thinking about grabbing a pair of fat boys but I’m still on a stock tune

[M4Lou]

Originally Posted by tom @ eas

If not opting for the Akrapovic pieces, we like the Evolution Racewerks Sport Series High-Flow Catted Downpipes. These are T304 Stainless, TIG welded, have high flow 200cpsi cats and are manufactured right here in the US. You can get then in brushed, polished or even hi-temp black thermal coated finish. This is what we install here, we know the ER guys for years and installed their products on customers (and our own) vehicles, including those on the track. The ER pieces are essentially bulletproof, so they can take the abuse. ER offers a non-catted version also.

If going the Akrapovic or ER route, you won't have anything to worry about. Feel free to PM me if you have any questions, I'm happy to help.

I've got ER mid's on my X3M and M4 - it's automotive jewelry.

The catted ER's (downpipes) are pretty easy to get rid of CEL w/ spacers? Non-tuned vehicles??

[81bear]

Originally Posted by Xanston

Does the OTS tune get rid of the CEL from the down pipes? I’m thinking about grabbing a pair of fat boys but I’m still on a stock tune

Yes it does.

[tom @ eas]

Originally Posted by M4Lou

I've got ER mid's on my X3M and M4 - it's automotive jewelry.

The catted ER's are pretty easy to get rid of CEL w/ spacers? Non-tuned vehicles??

Not a fan of O2 spacers. Recommend to either unlock/tune the DME or live with the CEL.

[markoz28]

Originally Posted by Xanston

Does the OTS tune get rid of the CEL from the down pipes? I’m thinking about grabbing a pair of fat boys but I’m still on a stock tune

Yes, and you will not regret the unlock and the OTS maps, or a custom tune for that matter.

[M4Lou]

Originally Posted by tom @ eas

Not a fan of O2 spacers. Recommend to either unlock/tune the DME or live with the CEL.

Short explanation of that Tom? Lean condition/lean misfire?
thanks.

[Tommyschuck]

HJS catted Downpipes - No CEL since 7k

[mike@x-ph.com]

Originally Posted by Tommyschuck

HJS catted Downpipes - No CEL since 7k

HJS are top cats and one the best on the market, along with the GESI EPA-approved ones

[Info@mad-us.com]

Originally Posted by Xanston

Does the OTS tune get rid of the CEL from the down pipes? I’m thinking about grabbing a pair of fat boys but I’m still on a stock tune

Yes, it has the option available.

[Info@mad-us.com]

Originally Posted by M4Lou

Short explanation of that Tom? Lean condition/lean misfire?
thanks.

The secondary o2 will throw a code if its not getting enough flow to the sensor to monitor properly.

[tom @ eas]

Originally Posted by M4Lou

Short explanation of that Tom? Lean condition/lean misfire?
thanks.

All of the above. It's a bootleg way of handling the issue and can cause serious issues long term.

[Indo Rider]

Originally Posted by tom @ eas

All of the above. It's a bootleg way of handling the issue and can cause serious issues long term.

Why won't anyone show anything quantitative about this? What is the serious issue? If you're saying it will throw off LTFT or cause the car to run too lean, can't someone show logs comparing a car with spacers that is doomed compared to nominal? Or can't someone show some documentation somewhere about how the post-cat switching sensor is actually used to calibrate the pre-cat sensor? Or how ECU tunes change something to completely ignore the post-cat sensor? Or explain why running catless downpipes without spacers (CEL expected) with stock tune doesn't also throw off the pre-cat calibration?

I really want to understand the details, but nobody who claims to know is willing to talk details...

[evidence]

Originally Posted by Indo Rider

Why won't anyone show anything quantitative about this? What is the serious issue? If you're saying it will throw off LTFT or cause the car to run too lean, can't someone show logs comparing a car with spacers that is doomed compared to nominal? Or can't someone show some documentation somewhere about how the post-cat switching sensor is actually used to calibrate the pre-cat sensor? Or how ECU tunes change something to completely ignore the post-cat sensor? Or explain why running catless downpipes without spacers (CEL expected) with stock tune doesn't also throw off the pre-cat calibration?

I really want to understand the details, but nobody who claims to know is willing to talk details...

It's the same idea as a piggy back vs a tune. Would you prefer to lie to the DME and have it operate w false inputs, or have it pulling in the real data?

Downstream narrow band sensors are used to calibrate the upstream wideband sensor. Unlikely to to cause an issue and the car will work around the downstream giving seemingly bad data, but why not allow everything to run as the builder intended, if possible?