[IISevv]

I just bought a full bolt-on 2007 335i and absolutely the car with one exception. It has catless downpipes with no secondary cats and there’s an extremely strong burnt gas smell from outside the car as well as inside at a stoplight with the windows down (It’s not a leak). I know that no cats will increase the smell but I have been in multiple 335’s with catless downpipes and none smelled this bad-any reason for this?

[dannyjones]

My n55 smells awful too. I even had complaints at work from people entering the garage behind me

[Jonah335]

I have a set of secondary cats OEM from my car if you would like to purchase. seems like the best option for you is to put secondaries back in so you can keep the free flow DP but reduce the smell. it doesn't bother me though

[Bullcitybmmer]

The smell on my N55 grossed me out as well right after I put on catless DPs. I wound up going to a muffler shop and having 2 tiny high flow cats welded in really close to where earlier E9Xs had secondary cats. It really took the edge off and has made no noticeable difference to performance.

[Socket]

Originally Posted by IISevv

I just bought a full bolt-on 2007 335i and absolutely the car with one exception. It has catless downpipes with no secondary cats and there’s an extremely strong burnt gas smell from outside the car as well as inside at a stoplight with the windows down (It’s not a leak). I know that no cats will increase the smell but I have been in multiple 335’s with catless downpipes and none smelled this bad-any reason for this?

N54 right not N55?

[TheMidnightNarwhal]

Originally Posted by IISevv

I just bought a full bolt-on 2007 335i and absolutely the car with one exception. It has catless downpipes with no secondary cats and there’s an extremely strong burnt gas smell from outside the car as well as inside at a stoplight with the windows down (It’s not a leak). I know that no cats will increase the smell but I have been in multiple 335’s with catless downpipes and none smelled this bad-any reason for this?

Well you said you don't have second cats. Maybe the 335s you have been in only had downpipes and still 2nd cats?

[nsjames]

catless cars smell bad.

that's just how it is. There's a reason we put them on cars in the first place.

[IllSic_Design]

I still have secondary cats and never really notice the smell. Might want to put some back in.

[IISevv]

I figured. Just didn’t know if it was normal or if it might just be running way too rich. I might just put 200 cell secondary cats in if it gets too much.