Thread: Exaust question

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Since you didn't spec what type of car (or truck) ... the answers are going to be very general.

Yes, you can run "4 pipes" ... the biggest question you have to ask youself is "Where do I want the non-muffler pipes to exit?"

The biggest problem you will face is if you want to have everything dump at the rear of the vehicle. There generally is not room for 4 pipes to run the length of the vehicle and still have it servicable.

Most guys will run a set of "dumps" just behind the front wheels, or somewhere close to there. Generally, they are nothing more than a 3" pips from just downstream of the manifold to a fitting with 3 or 4 bolts holding the cap (and gasket) on. 2 mintues with a wrench, and you now have open exhaust.

Go get friendly with your local Muffler Shop and get them to give you a free estimate. Most small muffler shops will do that for you. With the car in the air, and a "pro" looking at it, they can give you a pretty good idea of where the pipes will fit, and what clearance issues you may run into with your car.
--- the biggest problem usually is getting past the frame rails without sacrificing a lot of clearance - on larger cars you can sometimes run the pipes (dumps) to the front of the rear wheel wells. It's getting up and over the rear axle that tends to cause all the problems with running 4 pipes out the back ... things like shocks, flex lines for brakes, gas tanks & filler necks etc. start getting in the way.


Overall - Unless you have managed to weasel a V8 into an MG or Mini Cooper, there should be no problem doing what you have in mind. It's really nothing more than cutting two holes in the y-pipe, and extending to a set of caps at the edge of the vehicle.

IMO - the farther back you set the dumps, the better the sound. Dumps right at the motor are just loud, while dumps at the rear wheels have a bit more tone to them, but will still require some Advil or Tylenol after a few minutes.

Words of Warning ... DON'T get talked into having your Dumps exit under the vehicle (between the frame rails) Not only is it hard on your health is you ever sit and idle, but you are running very hot gases right onto your floor boards. Trust me, the soundproofing/underpadding in a vehicle smells very very bad when it starts to burn. And with a layer of carpet over it, it's very hard to put out once it does start to smolder.