435i back box removal

[Way2Fast]

Hi guys,

Is a back box removal worth doing for improvement on sound on my 435i? Currently have the res removed but was looking for just a bit more sound from the exhaust. The only downside is the valve will stay open if I get it done, so eco pro will sound like sport mode. I don’t want to spend 1k+ on a cat back neither

If anyone on here has had it done on this car or similar I would appreciate your thoughts.

Thanks in advance

[anonymous-user]

No, leave it alone for God’s sake. You’ll be inside the fecking thing. Don’t deafen the rest of us

[Way2Fast]

Funkstar De Luxe said:

No, leave it alone for God’s sake. You’ll be inside the fecking thing. Don’t deafen the rest of us

Haha. It’s not that loud, it’s nothing compared to a straight pipe. I’ve got a friend with a vxr catback which passes MOT’s and that pretty loud to say the least

[Easternlight]

I've just been on the "council" thread then ended up here! Coincidence

[V8 Stang]

How well sealed are the underside of a 4 series to the inside?

As you will be gassing the exhaust gasses to the underside of the car, rather than out the rear.....

Also won't it look weird at the rear, as there is probably cut-outs for the exhaust which will no longer have anything in.


Would be better of spending a couple hundred on after-marked backbox's.

[Andeh1]

Funkstar De Luxe said:

No, leave it alone for God’s sake. You’ll be inside the fecking thing. Don’t deafen the rest of us

This.

You'll think cool, everyone else will think tt.

[f1nn]

I’d say why stop at the resonators and back boxes, just remove the entire exhaust system and be done with it.

It’ll no doubt sound “sick”

[anonymous-user]

Andeh1 said:

Funkstar De Luxe said:

No, leave it alone for God’s sake. You’ll be inside the fecking thing. Don’t deafen the rest of us

This.

You'll think cool, everyone else will think tt.

OPs other post is about how to stick on a spoiler. I think that ship has sailed

[Way2Fast]

stickleback123 said:

Andeh1 said:

Funkstar De Luxe said:

No, leave it alone for God’s sake. You’ll be inside the fecking thing. Don’t deafen the rest of us

You'll think cool, everyone else will think tt.

OPs other post is about how to stick on a spoiler. I think that ship has sailed

Loads of boring old men on here that have nothing better to do. Bit sad really

[joropug]

It might not give you the sound you’re after - a friend deleted the back box on a 530i e39 and it sounded lovely under load quiet all other circumstances, but another friend did the same on a seat Leon and there was literally no difference in sound.

The resonator that you’ve already done seems to be the most popular option for your car

[SlimJim16v]

The proper way to do it is to leave the resonator and replace the rear silencer with a straight through one.

[Way2Fast]

joropug said:

It might not give you the sound you’re after - a friend deleted the back box on a 530i e39 and it sounded lovely under load quiet all other circumstances, but another friend did the same on a seat Leon and there was literally no difference in sound.

The resonator that you’ve already done seems to be the most popular option for your car

Yes true. I’ve seen quite a few vids with the back box delete and resonator on my car but the videos don’t do it justice. It does sound currently pretty good, going to have to just think about it

[CarCrazyDad]

Way2Fast said:

stickleback123 said:

Andeh1 said:

Funkstar De Luxe said:

No, leave it alone for God’s sake. You’ll be inside the fecking thing. Don’t deafen the rest of us

You'll think cool, everyone else will think tt.

OPs other post is about how to stick on a spoiler. I think that ship has sailed

Loads of boring old men on here that have nothing better to do. Bit sad really

I'm not into modifications but this is a bit sad... People are very negative.

[Ninja59]

Either do it the correct way or don't bother.

Most I have seen doing both usually end up complaining about it droning at constant speed.

[0ddball]

Don't listen to these boring old farts. Sounds like a cracking idea.

In fact, I think the only thing that could trump it for class would be an Aston with a cherry bomb.

[321boost]

Way2Fast said:

stickleback123 said:

Andeh1 said:

Funkstar De Luxe said:

No, leave it alone for God’s sake. You’ll be inside the fecking thing. Don’t deafen the rest of us

You'll think cool, everyone else will think tt.

OPs other post is about how to stick on a spoiler. I think that ship has sailed

Loads of boring old men on here that have nothing better to do. Bit sad really

that is PH for you