Dual Exhaust On A Bimmer.. Smart Or Not?

[miztuhdan]

uh i have a 325i 05.. i'm an ///M addict and also i have an obsession with power.. should i go for dual exhausts on my car? i heard it's dumb to put dual exhausts on inline 6's but uh.. m3 has it.. good idea or no?

[BaLAnCe17]

i have seen it done to other non M e46's...check cardomain. the m3 has 4 tips total, but it still comes from one mid pipe into one muffler...hopefully this helped lol, pry not though

[jrhaile]

I've seen lots of others do this locally.. great looking upgrade but I'm not sure about performance...

[miztuhdan]

thx for input. anyone else?

[3serbmdubya]

go for it, it would look tight and probably sound better maybe?

[BaLAnCe17]

of course it would sound better, you would pry end up w/ some hp gains cuz ure freeing up the exhaust flow. im an e36 owner and ive seen a few e46 w/ this mod. so im not much help sorry

[miztuhdan]

thx ! maybe the the dealer/muffler place can give me that info. much appreciated guys

[rsn48]

After reading many forums and adding a twin exhaust to a 94 318i, here is what I have found. If you do get a horse power increase, maximum it will be two hp. In fact in one comparison chart one twin exhaust lost the car .2% of hp but torque was increased. You will get an increase in torque.

Remember letting the car "breath" is a good idea, but to get maximum benefit you really would need to open up all the pipes from the engine all the way to the back, not just the extended muffler piece.

The 318i sounds awesome now, with a hint of power improvement, but it looks great.

[doughboyea]

Originally posted by rsn48@Feb 21 2005, 12:33 AM
The 318i sounds awesome now, with a hint of power improvement, but it looks great.

[snapback]295886[/snapback]

Right... so that 318i is a 4 cylinder... what about a 2.8L six (or in the original poster's 2.5L)? Should sound deeper/more aggressive?

Is it simply modifying the rear end of the car, buying an M3 exhuast setup (aftermarket) and bam? Is that all? What would that installation cost? Don't forget that a new rear bumper would have to be fabricated/purchased, modified aftermarket M3 rear bumper?

Dough

[IAmNotAtGregs]

i'm still mad at BMW for not making an e46 m3 sedan. If i ever have any money, then im going to take an e46 3 series and put the m3 engine in, suspenion, tranny, everything. And then ill own all the bitchez in the world.

[doughboyea]

Originally posted by IAmNotAtGregs@Feb 21 2005, 11:08 AM
i'm still mad at BMW for not making an e46 m3 sedan. If i ever have any money, then im going to take an e46 3 series and put the m3 engine in, suspenion, tranny, everything. And then ill own all the bitchez in the world.

[snapback]296231[/snapback]

Right.... I guess I would buy (assuming I had the money now).

Dough

[rsn48]

I don't recall off hand what the M3 bumper is like. On the 318i, part of the bumper was cut away so that it would accept a twin exhaust; original only had a single exhaust; the opening was too narrow for a twin. It was no big deal to cut the bumper, then add some touch up paint to the affected area; it looks great.

[doughboyea]

Just did a quicky search:
GruppeM titanium exhuast $2600.00!


Eisenmann Exhuast $1300.00


Active Autowerks $1200.00


Looking from the last pic of the AA exhaust, the piping is in the same location. I'm just a novice in this, however, you really could retrofit the exhuast in there assuming that nothing else gets in the way.

Pics are obviously from M3motorwerks.com, it was a good place to find examples of prices and pics. Maybe there are cheaper prices elsewhere.

Dough

btw, some of those above manufactures claim a +8hp gain on the M3....

[miztuhdan]

thx for the help. although i guarantee you i'm not spending $1000+ on a 8HP boost exhaust lol.. im not even in it for the HP boost. i just dont want a HP decrease. im selling my car in a few years to a family member or something b/c im getting an ///M. but i wanna make it look nice for them

[alanh]

i think that type of four tips on a stock 3 is pointless and is pretty "rice", somthing a guy with a civic would do, and i doubt that you make any horsepower...although i would laugh