Originally Posted by bkswede' post='816287' date='Mar 13 2009, 07:42 PM

A member, sapphire 535i, stated in a thread a month or so ago that the company he works for, Asthetik Motorsports in Dallas, was working on catless downpipes for the 535i, which were to be released soon. Not sure if they are planning on building catted DPs as well. Maybe he will chime in and let us know if there are any updates on their DPs.

Originally Posted by GENEaTALS' post='816293' date='Mar 13 2009, 07:53 PM

I would stay with the same manufacturers when it comes to performance mods, as fittement and overall gains are optimized if you stay with the company IMO...


I wonder if O2 sims would be needed even if RPI or any company decided to produce DP's for the 535

Originally Posted by GENEaTALS' post='816293' date='Mar 13 2009, 09:53 PM

I would stay with the same manufacturers when it comes to performance mods, as fittement and overall gains are optimized if you stay with the company IMO...


I wonder if O2 sims would be needed even if RPI or any company decided to produce DP's for the 535

Originally Posted by bkswede' post='816463' date='Mar 14 2009, 06:19 AM

I agree with you; however, unlike 135/335 owners, it doesn't appear that we will have the ability to choose multiple mods from the same manufacturer (at least not any time soon)...

Originally Posted by dbae1978' post='816780' date='Mar 14 2009, 04:15 PM

If there is a large enough demand for them, I can't imagine why RPi wouldn't want to develop them.
the n54 platform is going to be here for a while, now that BMW has decided to go the forced induction route.

Originally Posted by bkswede' post='816817' date='Mar 14 2009, 03:07 PM

I think we will eventually see mods that are specific to the e60 platform (e.g., DPs, exhaust, FMIC, etc.), just seems like all the companies are busy developing products for the 135 and the 335, as there is a bigger market for those. Any info you can share with us on your RPi exhaust?

Originally Posted by dbae1978' post='816142' date='Mar 13 2009, 04:38 PM

That's right, I remember Eloy saying there aren't any aftermarket catalytic converters....
i tried to get a used set at a junkyard for my previous car and they weren't allowed to even sell them to me.

Correct me if I'm wrong Gabe, I was told the 535i only had cats at the down pipes and doeesn't have secondary catalytic converters like the other e60 models. I think the 535 has dual resonators in the section twos and the
resonator box by section three.

Originally Posted by NobleForums' post='817643' date='Mar 15 2009, 04:55 PM

4 cats.

Two "pre" in the downpipes:



Two "main" in the section 1:



Past that, it looks to have a resonated Y pipe where the two 60mm pipes become a single 85mm pipe, then two mufflers at the rear.

Originally Posted by dbae1978' post='818695' date='Mar 16 2009, 04:47 PM

my mistake, when the car was on the lift, I heard somewhere, the secondary cats were resonators.

Originally Posted by NobleForums' post='818773' date='Mar 16 2009, 06:14 PM

They're often referred to as bottle resonators, especially in the aftermarket, because they do act as resonators, quieting down the system. However, that's secondary to their primary function as cats.