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Old 08-30-2010, 09:18 PM   #1
teen ti
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Default Straight Pipes

I'm looking to straight pipe my '97 318ti and was wondering how difficult it would be to do the job myself, any and all comments are appreciated
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Old 08-30-2010, 09:27 PM   #2
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Do you know how to weld?
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Old 08-30-2010, 09:33 PM   #3
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i can weld to an extent, if i just need to make it attach i can do it well enough, although would it be easier to just delete the muffler and pipe it from there?
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Old 08-30-2010, 09:55 PM   #4
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But the pipe 20-40 12ft bucks take it to mineke or Midas 150 or less they bend it and weld it done deal...

That's what I dis w mine
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Old 08-30-2010, 10:04 PM   #5
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Why would you want to do this? What are you trying to accomplish?
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Old 08-30-2010, 10:20 PM   #6
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i'm doing this to achieve results similar to a sport exhaust system that would run me $400+ for considerably less
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Old 08-30-2010, 10:20 PM   #7
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Free flow exhaust??? .

Are you changing pipe size.. Cat delete? Res delete?
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Old 08-30-2010, 10:28 PM   #8
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i'm gonna keep the size the same and at the very least delete the muffler but will most likely delete the cat and resonator
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Old 08-30-2010, 10:38 PM   #9
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Ok.. So no need to actualy bend pipes .. Get an aftermarket exhaust ..2 pipes 2 1/4in
Cut cat/ cut res

Weld pipes.. Or like I said take it to a shop it won't b more than 100 bucks.. I'm sure in ny there's gotta b cheap shops
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Old 08-30-2010, 10:40 PM   #10
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i've got better than cheap shops, one of my buddies' dad has a shop and they did a straight pipe on his '91 318is so i'm hopefully gonna get help from them
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Old 08-30-2010, 10:46 PM   #11
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There u go lol.. I did my exhaust 2.5 in header back cat/res delete to a 2.5 brola exhaust for 240 everything
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Old 08-30-2010, 10:47 PM   #12
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sounds like a good deal
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Old 08-30-2010, 10:49 PM   #13
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20 for a 12ft 2.5 pipe.. 100 for labor 120 for the exhaust
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Old 08-30-2010, 10:53 PM   #14
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thats not bad at all, and hopefully the labor won't cost anything seeing as that i'll do it with my buddy
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Old 08-30-2010, 11:05 PM   #15
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Quote:
Originally Posted by teen ti View Post
i'm doing this to achieve results similar to a sport exhaust system that would run me $400+ for considerably less
An aftermarket exhaust system only has two benefits for these cars. The first and most obvious is sound. Straight pipes will not accomplish this. In fact, it'll just make your car sound like a riced out piece of crap, thus making you look like a doucher everywhere you go. The only other benefit of aftermarket exhaust is weight savings. The stock exhaust is rather bulky. However, it's positioned in the best possible spot for something of it's size and weight. Low and over the rear wheels. If your goal is weight reduction, there's about a dozen other things that could be addressed before ghettofying your German engineered auto with some cheap ass hillbilly bs.

A NA 1.9L 4 banger is not going to growl like a V8 no matter what kind of exhaust you're running. If anything, there's only 2-5hp max to be gained by installing a QUALITY aftermarket exhaust that has been designed and engineered specifically for our cars. However, whatever you gain on the high end, you're sure to lose on the low end. So while your engine may "breathe" better at high RPM's, it'll "gasp" at low RPM's. In other words, you'll lose low end torque which will cause your car to be sluggish off the line.

Are you considering deleting the catalytic converter? If so, keep in mind it's a $1500 part. So right off the bat, you're decreasing the value of your car significantly. Besides being illegal, your car will not pass inspection and potential buyers can sue you if you do not disclose the fact that you've deleted a critical part of the vehicle's emission system. Before you say that your state doesn't test or you know a place that will cheat the system, it's a FEDERAL law. The EPA is a federal agency and regardless if certain states test, removing or altering any part of a vehicle's emission system that is to be driven on the highway is illegal and punishable by healthy fines and/or possibly jailtime.

Let's say you ignore what I've already layed out and you decide to do it anyway. So now your car is annoyingly loud, runs like crap since the o2 sensors aren't giving ACCURATE readings and the engine is running too lean or rich aside from being a slug off the line from loss of low end torque, resale value and fuel economy have gone out the window since nobody wants to buy a car from some teenager who has molested it with ghetto/hack mods and the only attention you'll draw aside from the cops will be people looking at you thinking you're just some cheap ass idiot teenager driving a de-valued BMW. All so you can THINK you're cool when you tell your friends "my BMW has straight pipes..."

Your car is not going to be any faster and you're not going to look any cooler. But hey, do what you like, that's just my opinion.


BTW FWIW, there's been reports from people with supercharged 318ti's who tried running 2.5" catbacks, only to find out that they lost a significant amount of low end torque. That's with a FI setup, imagine how a free flowing system will affect a NA motor.

Last edited by cooljess76; 08-31-2010 at 12:07 AM.
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