[E63M6_G42M240i]

I’m thinking of starting with a DP since the rest of the exhaust system does little to nothing. I do not like rasp, excessive burbling, and prefer deep tone. Should I go resonated or 200 cell catted? If I go resonated thinking of keeping secondary cats (therefore no single pipe) to cut the smell/fumes. Thoughts?

[SwankPeRFection]

Ask yourself what the max power level you want for the car. If you’re going to stay at 800 or under, just do GESI catted downpipes so you don’t have to worry about a CEL until you get a flash done. If you do 200 or no, you will set a CEL for CAT efficiency.

[AhsanU]

Start with a valve controller, or wire the valves open completely so you actually hear what your car sounds like. AWRON has one, dÄHLer has one, etc. A bit of research as to which one works best for you should be conducted.

It sounds like MAD's resonated/catted downpipes + VT EL midpipes are your best bet according to what you're looking for. Catted dp's will be a bit quieter but resonated will be loud but less rasp, so it's up to you. Do not worry about the smell from the downpipes as there isn't any from in cabin even with the windows down. I put nearly 22k miles on mine and didn't smell anything in cabin but it is there if you're standing outside of the car with the car on.

But you absolutely should get a single midpipe if you're after a deeper sound with less/no rasp.

[G MONEY]

Sounds like you bought the wrong car for your exhaust hopes

[forcefed]

Originally Posted by G MONEY

Sounds like you bought the wrong car for your exhaust hopes

I heard a g80 the other day with a catless dp, custom single midpipe(looks like any other midpipe actually but it was one piece and thick wall tubing) and a dinan catback and it sounded amazing, zero rasp.
I wonder if the thin wall tubing that most midpipes are made of contribute to the rasp.

[G MONEY]

Originally Posted by forcefed

I heard a g80 the other day with a catless dp, custom single midpipe(looks like any other midpipe actually but it was one piece and thick wall tubing) and a dinan catback and it sounded amazing, zero rasp.
I wonder if the thin wall tubing that most midpipes are made of contribute to the rasp.

I heard a bunch in the fall at a charity event at the Wells Fargo center in Philly. I heard at least 12-15 with exhaust and I can’t say any of them sound good. Sound OK at best. Everyone has a different take on sound.

[forcefed]

Originally Posted by G MONEY

Everyone has a different take on sound.

True, I just installed a single midpipe and not perfectly satisfied with it, a bit raspy with the valves open so still looking for that perfect sound.

[kgelfen360]

Originally Posted by forcefed

True, I just installed a single midpipe and not perfectly satisfied with it, a bit raspy with the valves open so still looking for that perfect sound.

Which mid pipe did u go with?

[ChrisM4]

Originally Posted by E63M6_G42M240i

I’m thinking of starting with a DP since the rest of the exhaust system does little to nothing. I do not like rasp, excessive burbling, and prefer deep tone. Should I go resonated or 200 cell catted? If I go resonated thinking of keeping secondary cats (therefore no single pipe) to cut the smell/fumes. Thoughts?

I’m considering this very thing. DPs and big daddy’s with everything else bone stock on the exhaust (including keeping stock exhaust valve control)

Exhaust stays in tact, easy to convert back if I decide not to buy out the lease in a couple of years, zero drone.

Also considering coding out ASD while I’m at it too…

[E63M6_G42M240i]

Originally Posted by ChrisM4

I’m considering this very thing. DPs and big daddy’s with everything else bone stock on the exhaust (including keeping stock exhaust valve control)

Exhaust stays in tact, easy to convert back if I decide not to buy out the lease in a couple of years, zero drone.

Also considering coding out ASD while I’m at it too…

I’ve heard o2 sensor spacers can affect performance. There’s a YouTube video on that. I’m hesitant because of that.

[ChrisM4]

Originally Posted by E63M6_G42M240i

I’ve heard o2 sensor spacers can affect performance. There’s a YouTube video on that. I’m hesitant because of that.

With catless DP’s if you use their minicat version with the built in little cat in the tube you shouldn’t throw a cel. With the HF catted versions using the spacer without mini cat inside is supposed to be the best.

Personally I’d just go catless with the rest of the exhaust stock. There are a few videos around with this setup and it sounds amazing and is completely reversible.

[E63M6_G42M240i]

Originally Posted by ChrisM4

With catless DP’s if you use their minicat version with the built in little cat in the tube you shouldn’t throw a cel.

Are you referring to the apex built DP’s with the built in minicats or using another catless brand and the big daddy mini cats?

[forcefed]

Originally Posted by kgelfen360

Which mid pipe did u go with?

Looks exactly like mad's single midpipe.

[ChrisM4]

Originally Posted by E63M6_G42M240i

Are you referring to the apex built DP’s with the built in minicats or using another catless brand and the big daddy mini cats?

Big Daddy’s sell O2 spacers that have the mini cat built in. You can use them with any resonated or catless downpipes.

If you get 200 cell cats you’d want to use big Daddy O2 spacers that are just hollow with no mini cats.

The ones you are talking about are also good but have the minicat actually inside the downpipe itself. Personally I’d prefer the cat in the O2 spacer itself.

[evidence]

Originally Posted by SwankPeRFection

If you do 200 or no, you will set a CEL for CAT efficiency.

Originally Posted by ChrisM4

If you get 200 cell cats you’d want to use big Daddy O2 spacers that are just hollow with no mini cats.

The ones you are talking about are also good but have the minicat actually inside the downpipe itself. Personally I’d prefer the cat in the O2 spacer itself.

200 cell cat w stock sensor mounting, no CEL here, AZ.

[SwankPeRFection]

Originally Posted by evidence

200 cell cat w stock sensor mounting, no CEL here, AZ.

Which ones specifically and how many miles have you put on them in all different conditions? Secondary efficiency codes can be circumstantial sometimes if the CATs are just good enough… they could trip during long cruise control drives or just pulling out of a parking lot within 2 miles if you were parked long enough to be a warm start but long enough for the exhaust to cool down fully.

[TopJimmy]

If you want deep tone but don’t like burbles or rasp, keep your stock cats and get the single midpipe. That’s all you need to start.

[evidence]

Originally Posted by SwankPeRFection

Which ones specifically and how many miles have you put on them in all different conditions? Secondary efficiency codes can be circumstantial sometimes if the CATs are just good enough… they could trip during long cruise control drives or just pulling out of a parking lot within 2 miles if you were parked long enough to be a warm start but long enough for the exhaust to cool down fully.

MAD 200 cell, though all the non GESI DPs are basically using the same cats. 7k miles of daily driving use.

[Info@mad-us.com]

200 cell and a midpipe with stock valves is my go to for the least rasp.

[E63M6_G42M240i]

Originally Posted by Info@mad-us.com

200 cell and a midpipe with stock valves is my go to for the least rasp.

Resonated mid? How long do aftermarket 200 cell cats last? Don’t want them destroying my turbos, if that’s true?

[mike@x-ph.com]

upgrading the downpipe will increase rasp. catted are a lot better than catless, but if rasp is a concern i would not start with the downpipes.

the single midpipe is the best starting point in my opinion. if you are keeping the downpipes stock, get the non-res option.
if you are upgrading the downpipes, get the resonated midpipe

[E63M6_G42M240i]

Originally Posted by mike@x-ph.com

upgrading the downpipe will increase rasp. catted are a lot better than catless, but if rasp is a concern i would not start with the downpipes.

the single midpipe is the best starting point in my opinion. if you are keeping the downpipes stock, get the non-res option.
if you are upgrading the downpipes, get the resonated midpipe

Thank you Mike. I think I’m landing on 200 cell catted with single resonated keeping the stock box for now. The only thing I’m worried is that the 200 cell catalysts blow out?