Call me Crazy...... (Straight Pipes)

[drifty30]

So. I live in the GREAT state of minnesota and we dont have emissions. I have a 91 318is with the M42 motor. Being that i dont have a HUGE moral delema polluting the air with my car, what would stop me from getting a 2.5 or 2.25 inch pipe custom bent from the header back running to one muffler? I understand that there would be very little backpressure... but i feel like my valve springs are capable enough to not get any float like big V8 guys. Also... i was looking underneath my car... and the pipe that i would get bent wouldn't really have many bends in it at all.... it would be fairly straight. I wanna hear everyone's input good or bad.... but back it up.

[Jand3rson]

You're crazy.

[AndrewBird]

IT's a good idea in my book. Less back pressure, to a point, is good. Jordan want's this done since he (and I) live in Oregon where there are also no emisions laws. You might have a hard time finding a place to bend it for you. If it is illigal to run without a cat, most places won't do it becasue they will get in trouble if you are caught.

Andrew

[drifty30]

i'd probably just ask them to bend pipe to my measurements and stuff (and not tell them what it's for). i could do that then get it welded and then just bolt it on myself. noone would be put in any "law abiding" moral issue or be put on the spot. what do you think would be wrong with it?

[Rob]

cons: It'd be loud with just a muffler. At least add a resonator. Other than that, I'd love to see/hear it

[slammed_e30]

I ran straight pipes for awhile but they are really loud, and 80 on the freeway with a 3.73 means you can't hear your radio. That is the reason I put the cat back on.

[E30godz]

maybe its the turbo...but im running a straight pipe all the way back to the brullen muffler and its very liveable...i love thesound

[OOMPH!]

I ran straight pipes for awhile but they are really loud, and 80 on the freeway with a 3.73 means you can't hear your radio. That is the reason I put the cat back on.

Damn, it would be that loud? :shock: Have any soundclips?

[KenC]

Oregon where there are also no emisions laws.

We have emission standards in the Portland area. I was struggling to pass them a few months ago. I bought a new cat and a new O2 sensor and passed with flying colors.

[e9nine]

I ran straight pipes for awhile but they are really loud, and 80 on the freeway with a 3.73 means you can't hear your radio. That is the reason I put the cat back on.

Damn, it would be that loud? :shock: Have any soundclips?

It depends on what muffler you are running. M y 2.7i was def. not obnoxious though it was loud, mean and raspy in a nice way for a cheap mod heh heh. I was running an OEM eberschpacher catback with it..

[BMW BMXER]

My car emission exempt after my next emissions test its considered a 'classic'

[e9nine]

My car emission exempt after my next emissions test its considered a 'classic'

[Saul325is]

Re: Call me Crazy...... (Straight Pipes)

So. I live in the GREAT state of minnesota and we dont have emissions

I hate you.

[BMW BMXER]

My car emission exempt after my next emissions test its considered a 'classic'

I have one more emissions test.

After that I do not have to do, or worry about, emissions tests ever again.

[MR 325]

For sure get rid of the cat[s] on that thing. Both of my cars have no cats but I live in CA where we have emmisions testing every 2 years so that kinda blows. I think I will agree with Rob though, a resomator would be a good idea justy because motors do run better with some back pressure.

No cats is the way to go... :)