[Zoorah12]

So I just got myself an incredibly clean 07 335i coupe 6MT and went through the process of getting the car completely in order as far as maintenance replacements, walnut blast, etc. I have a JB4 on the way this week as well as a dual cone intake. Aside from a couple exterior aesthetic changes and potentially an lsd, the only other thing I plan to do is get an exhaust system.

I've been spending hours pouring over the forums online for advice, and watching videos of the way different exhausts sound. The problem is it's incredibly hard to really know what to get because the exhaust sound doesn't always translate the same over video.

I'm a big fan of the way the stock exhaust sounds already- the way it crackles and burbles when you lift off the throttle or downshift, screams in the higher rpm's, but also can settle down on the highway. I'd like to get some recommendations on exhausts that would enhance these characteristics without becoming overly loud and droning.

Any suggestions?

[Mr. Tasty]

Hands down

VSRF catless DP's(or similar) and OEM exhaust back. Best sporty sounding exhaust while still being refined. I love how mine sounds. Plenty of gurgles and pops with MHD.

Cold Start

Warmed Up

[STR8-6IX]

if you want a subtle upgrade, you will be happy with a secondary cat delete. I got mine done at a local muffler shop for $140 CAD and was very happy with the outcome. you will get more engine sound, more burbles, a throatier exhaust note and better throttle response + a stronger top end pull.

if this is not enough, install a downpipe like the user above me recommended. it will make your stock exhaust system sound excellent and the power gains are more then worth the price. if you do decide to go this route. you NEED a stage 2 tune. running a downpipe without a tune is a bad idea.

if you are looking to keep factory downpipe, a secondary cat delete and PE mod to your stock muffler will likely be more then enough for you. I recommend against going for a catback because the stock exhaust system is a very good design and the OEM piping is high quality.

[mweisdorfer]

You said "subtle" upgrade. So, I'd acquire the 335is mufflers. That would be the next step up. They are $400-500.00 used or $795.00 brand new plus shipping.

[Rsoxs19]

Catless downpipes and stock exhaust.

[YasF80_SLO]

M Perf Exhaust or PE Mod, PE mod is 300-400$ at a muffler shop, PE is 1500~ new plus install. Both sound AMAZING, and will NOT effect emissions, only sound.

[Boston335iGuy]

I have the PE and love it, you can be low key or rev it out and hear all those loud crackles and burbles when you want

Bought mine used $500

[Jarrod]

+1 on getting the 335is exhaust. More subtle than the BMW PE, but still gives great throaty sound. Saw one of these in the for sale area for $400 the other day.

[Indyeah]

BMW PE
easy

[jt335i]

Replaced the OEM mufflers not too long ago with the BMW PE and love the new meaner sound WOT. A little bit louder than stock, but there’s no drone inside.
Enjoy hearing them with the windows down.

[STR8-6IX]

Originally Posted by Rsoxs19

Catless downpipes and stock exhaust.

This.

And Don't waste your money on the 335is mufflers when you can get almost the same sound + some basic gains from deleting your secondary cats for a fraction of the price.

[BobsBimmer]

Just put the BMW PE exhaust on my car this past weekend. Love the sound!!

[Al_335xi]

MHD Flash, your welcome.
best thing ever for little cost

[RileyZ]

BMW Perf exhaust

[dannyjones]

Originally Posted by STR8-6IX

if this is not enough, install a downpipe like the user above me recommended. it will make your stock exhaust system sound excellent and the power gains are more then worth the price. if you do decide to go this route. you NEED a stage 2 tune. running a downpipe without a tune is a bad idea.

Can you expand on this please? I'm about to get the vrsf downpipes (for n55). Why is it a bad idea without a stage 2 tune?
Thanks

[STR8-6IX]

Originally Posted by dannyjones

Can you expand on this please? I'm about to get the vrsf downpipes (for n55). Why is it a bad idea without a stage 2 tune?
Thanks

an ECU can adjust for many things (any exhaust mod except for primary cat delete) intake ETC. but removing or messing with your primary cats (downpipe) is too much of a difference for the ECU to properly adjust to in order for you to get all the possible gains from the downpipe. nearly half the gains are achieved from tuning your car to work with the downpipe. until then, the car runs very rich (the new downpipe lets tons of extra airflow through the engine, confusing the ECU and thus making it dump lots of fuel into the engine)

your fuel/ignition timing will be all over the place and the engine will not run well at all. you get CEL because of this which also needs to be tuned out. all in all, its just not a good idea. if you plan to install a downpipe without the tune, its best not to mess with your cats at all. either you do it properly the first time or dont do it at all. another important thing worth mentioning is that you may want to delete your secondary cats while you are down there. if your engine burns oil, they will eventually clog and limit boost so may as well cut them out. if you drive aggressively, you may went to upgrade your chargepipe to a metal one because the OEM plastic ones are shit.

another meaningful upgrade would be to change your intercooler because again, the OEM one is shit.

just make sure you get a tune if you're installing a downpipe!

[mweisdorfer]

You need a tune like an MHD for example that will fool the ECU into thinking that it still has the same hardware as stock, when you go to catless down pipes.

If not, your ECU will blow codes for starters. The engine probably won't run as well either.

If you get a better FMIC like a mishimoto or a VRSF, you should also get a better charge pipe like a BMS. Otherwise, the extra air intake will cause problems with your stock charge pipe.

[dannyjones]

Thanks for the replies. Makes sense that the different O2 readings would make the engine run rich.
However, just a couple of things. I planned on getting a JB4 primarily for the CEL delete, as I know I will get a CEL from the catless downpipes. But from what you've said above, does it mean I cannot run it in the 'stock' map, because stock the ECU won't be able to cope properly? (Even though that's why I'm getting the JB4, I'm pretty sure I'll enjoy the HP side effects )
Secondly, mweisdorfer, does the tune (JB4/MHD) really fool the ECU into thinking everything is stock? My understanding was that the ECU will still be throwing O2 codes, but the tune will keep deleting the codes to prevent a CEL.

Also, already have an aftermarket chargepipe since the cheap plastic OEM one cracked even though completely stock (nice one BMW...)

Oh, and is MHD available for the N55 now? Looks like it - but wasn't available last time I researched this. Would you recommend that over the JB4?

[STR8-6IX]

Originally Posted by dannyjones

Thanks for the replies. Makes sense that the different O2 readings would make the engine run rich.
However, just a couple of things. I planned on getting a JB4 primarily for the CEL delete, as I know I will get a CEL from the catless downpipes. But from what you've said above, does it mean I cannot run it in the 'stock' map, because stock the ECU won't be able to cope properly? (Even though that's why I'm getting the JB4, I'm pretty sure I'll enjoy the HP side effects )
Secondly, mweisdorfer, does the tune (JB4/MHD) really fool the ECU into thinking everything is stock? My understanding was that the ECU will still be throwing O2 codes, but the tune will keep deleting the codes to prevent a CEL.

Also, already have an aftermarket chargepipe since the cheap plastic OEM one cracked even though completely stock (nice one BMW...)

Oh, and is MHD available for the N55 now? Looks like it - but wasn't available last time I researched this. Would you recommend that over the JB4?

honestly, i would recommend basically everything over the JB4. it just seems to be causing nothing but problems for you turbo guys.

I think your best bet would be to find a shop which does ECU tunes and have them tune specifically for your downpipe. you will get good gains by doing this.

and yes, it is a good idea for sure to replace your stock chargepipe.

if you plan to continue with mods, I wouldnt bother with dual cone intakes or any sort of aftermarket intake system unless you are pushing huge turbo boost, upgraded the turbos etc. where the factory airbox becomes a bottleneck. otherwise, theres really nothing wrong with the stock one as they are well designed. next up could be an intercooler upgrade, easily more effective especially since I heard the stock ones are also shit.

[Zoorah12]

Thanks for all the replies! I just did the install of the jb4 and dci. I've thought hard about going catless downpipes with the stock exhaust system. But in my last car with catless it had a very strong smell and i've heard that's the case with the 335 as well. Is this accurate?

[Rsoxs19]

I have a full catless system and it doesn't smell that bad on regular gas. When I put e85 in I can definitely smell it lol.

[N54Luvr]

Originally Posted by STR8-6IX

honestly, i would recommend basically everything over the JB4. it just seems to be causing nothing but problems for you turbo guys.

I think your best bet would be to find a shop which does ECU tunes and have them tune specifically for your downpipe. you will get good gains by doing this.

and yes, it is a good idea for sure to replace your stock chargepipe.

if you plan to continue with mods, I wouldnt bother with dual cone intakes or any sort of aftermarket intake system unless you are pushing huge turbo boost, upgraded the turbos etc. where the factory airbox becomes a bottleneck. otherwise, theres really nothing wrong with the stock one as they are well designed. next up could be an intercooler upgrade, easily more effective especially since I heard the stock ones are also shit.

Are you guys seriously putting up with all this mis-information this guy is spewing.

You drive a NA car and have all this useless information for everyone.

You have admitted to being 18 years old and driving your first BMW ( which I don't believe btw ), why don't you just be a good little boy and listen and learn.