[Rogue-OP]

I just got an N54 (335i) and lord knows what's under the hood as far as mods go. It's a few hours away being worked on by my buddy and I'm going to have him take it to a shop to get inspected. I'd like to send him with a list of parts to look out for.

At the moment, all I know is it has dual cone intakes. If that's all it has, I'll just swap to stock temporarily to pass smog. If it has more mods... well then, I'll have to figure something out... I'll need it to pass smog to get it in my name.

From my research the following is not permitted in California and can make you fail a smog check:

-Catless Downpipes
-Secondary Cat delete
-Dual Cone Intake
-Intercooler
-Chargepipe with blow off valve
-Aftermarket Muffler that is louder than stock
-Any aftermarket part not listed as "CARB" approved
-Some tunes?
-Resonator delete?

What am I missing?

[ZeeVaughn]

BMS DCI's are CARB cert'd, but you need the sticker. You can order one from their website for a few bucks

[320IN54]

Wait your muffler has to be carb legal to pass? I dont think thats true because a muffler only affects sound and not emissions

[kong24680]

I've never had a problem with the muffler and dci. I think the only problem would be the downpipes and secondary cat delete.

[Jayer18]

Muffler delete has nothing to do with smog. If you are that paranoid, why did you get an n54?

[Brandon818]

I would just worry about dp's. You can possibly get away with it if you "know a guy"

[IllSic_Design]

Down pipes are the main one, and even then you can possibly pass with them.

[Rogue-OP]

Originally Posted by ZeeVaughn

BMS DCI's are CARB cert'd, but you need the sticker. You can order one from their website for a few bucks

Ah good to know. I'll have my buddy check what brand they are.

Originally Posted by GotPwned

Wait your muffler has to be carb legal to pass? I dont think thats true because a muffler only affects sound and not emissions

Perhaps not. At least the sound is supposed to be quieter than stock. I'm trying to cover my bases here.

Originally Posted by kong24680

I've never had a problem with the muffler and dci. I think the only problem would be the downpipes and secondary cat delete.

DCI will fail visual inspection from what I've read. Thanks for confirming the other two.

Originally Posted by Jayer18

Muffler delete has nothing to do with smog. If you are that paranoid, why did you get an n54?

Muffler delete would increase noise and risk calling attention to it. I'm not paranoid, I just a) don't want to fail smog and then have to deal with that shit every year (instead of every 2 years) and b) I'd rather not go through the trouble of "finding a guy" and paying a large sum to make it work if all I have are just the cones. I'm simply trying to compile a list and cross-check it with what's under my head before I go that route. Thanks for your valuable input.

Originally Posted by Brandon818

I would just worry about dp's. You can possibly get away with it if you "know a guy"

Yes, but I'd rather first check what I've got compared to this list to see if going that route is necessary.

Originally Posted by IllSic_Design

Down pipes are the main one, and even then you can possibly pass with them.

Thanks. I'd rather not risk failing because doing it every year afterwards sucks.

[bluemonstr]

you need to the dp fix to pass with dp's. Much better than going stock every other year...that is for sure.

[dataspike]

Charge Pipe and BOV, ask me how I know...

[west1]

BMS DCIs will pass visual if you have the sticker. sticker is $2.50 on their website, I think.

DCI's are pre Cat and do not modify the exhaust system of the car. SMOG is all about the exhaust system and pollutants. DCIs only allow freer airflow into the engine.

all these e9x are smogges via ODBII connection. all the car's data is transmitted to the smog computer.

here's the link for BMW for your reading:

http://www.burgertuning.com/BMW_N54_..._Upgrades.html

[puppydax]

Originally Posted by Rogue-OP

I just got an N54 (335i) and lord knows what's under the hood as far as mods go. It's a few hours away being worked on by my buddy and I'm going to have him take it to a shop to get inspected. I'd like to send him with a list of parts to look out for.

At the moment, all I know is it has dual cone intakes. If that's all it has, I'll just swap to stock temporarily to pass smog. If it has more mods... well then, I'll have to figure something out... I'll need it to pass smog to get it in my name.

From my research the following is not permitted in California and can make you fail a smog check:

-Catless Downpipes
-Secondary Cat delete
-Dual Cone Intake
-Intercooler
-Chargepipe with blow off valve
-Aftermarket Muffler that is louder than stock
-Any aftermarket part not listed as "CARB" approved
-Some tunes?
-Resonator delete?

What am I missing?

Some of the answers you will get are subjective. Every smog shop is different, some smog guys are hard ballers. Here's what will for sure fail you:

-DCI - Visual (without tags)
-Tunes/ECU Reset without readiness codes ready
-CP w/ BOV

The iffy:
-DP - Visual (if they look)

The maybe not so much:
-FMIC
-Muffler

When I smogged my car, I had an FMIC, Vac Canister Delete (lol), a stage 0 (stock) MHD flash, inlets and outlets and passed.

[DYOOS]

Originally Posted by bluemonstr

you need to the dp fix to pass with dp's. Much better than going stock every other year...that is for sure.

I'm assuming even with a DP fix, there'll still be the smell issue right?

[bluemonstr]

Originally Posted by RepBolt

I'm assuming even with a DP fix, there'll still be the smell issue right?

If you are referring to passing the smog (which is what this thread is about) - they don't even run your car. They just check the OBD2 port and hope your car rats itself out. The DP fix takes care of that. As far as smells associated - I couldn't tell you. I don't care about smells and for the most part haven't noticed.

[bluemonstr]

Originally Posted by puppydax

Some of the answers you will get are subjective. Every smog shop is different, some smog guys are hard ballers. Here's what will for sure fail you:

-DCI - Visual (without tags)
-Tunes/ECU Reset without readiness codes ready
-CP w/ BOV

The iffy:
-DP - Visual (if they look)

The maybe not so much:
-FMIC
-Muffler

When I smogged my car, I had an FMIC, Vac Canister Delete (lol), a stage 0 (stock) MHD flash, inlets and outlets and passed.

See this is where I think some people need to be smart. I went in w/out cats and had the DPfix to cover that part...I have DCI and MHD tune and upgraded LPFP and what I did was remove the DCI (go to stock) placed ALL the stock covers on the car and set my tune for a 'smog tune' to allow the dpfix to cover the cat part. I then REMOVED the MHD cable (I pretty much log/watch my gauges from my phone daily) but for the smog test - I removed ANYTHING that indicated I tuned my car - placed the OBD2 cover back on the port - and go for the test.

I do all that because you don't want ANY red flags for the tester...you give them NO reason to suspect your car is modded and they won't look for things. My car looked completely stock when I tested...meanwhile I had DPs on, I had a 'tune' that boosted to 19psi and I was running E85.

Keep the car as stock as possible - don't be lazy. Put your stock stuff back on - at least what can be seen. I love these cars because they are true sleepers. I don't get hassled by cops (compared to when I had my EVO) and I hardly ever get beat in a stop light match up. Last time was to another 335. lol Guy caught me not running E85 that day and he had inlets - NICE top end mod my the way.

[puppydax]

Originally Posted by bluemonstr

See this is where I think some people need to be smart. Keep the car as stock as possible - don't be lazy.

Agree with this portion of it. The DP's, however, are another story. You have to keep in mind that if you fail, you'll then be required to smog every year as opposed to every other. Which is why it's a subjective topic. Some get lucky, some get caught. lucky California.

[Banana Clipper]

Could always just find someone who can 'make' it pass... I'll find out in December

[DYOOS]

Seems like a lot of us are in the same boat as far as wanting to add performance mods and staying smog legal; particularly in CA. From what I've been reading in other threads, for the most part you can add a JB4/MHD tune, Intake, FMIC, CP, Exhaust as the basic bolt ons and still pass CA smog. You can also ad DP with a DP fix and possibly pass as well, or if you "know someone" which I am considering down the road.

That said, what are the other internal components that you can/should upgrade to help your performance mod? Basically, if you upgrade the CP, what are the other components that go along with the CP that you can/should upgrade to help the performance of the CP, whether it's performance related or reliability related?

This is the first car that I'm focusing solely on performance. All my past cars have mainly been cosmetic mods, but now that I'm older I'm looking to gain as much HP/TQ, and maintain the N55 reliability factor as well ...while staying CA smog legal ...for now