2000gt straight piped
Thread Starter
Joined: Apr 2003
Posts: 11
From: United States
2000gt straight piped
I have a 2000gt with flowmaster 40 series deltaflow mufflers and im thinking of installing a bbk(cheap) off-road xpipe with MIL eliminators and removing my mufflers. When emissions time rolls around i will just bolt up the stock assembly. My only concern is how it will run and sound with this little restriction and back pressurem, should i keep my mufflers or no?
Joined: Apr 2003
Posts: 18
From: United States
2000gt straight piped
You'll definitely want to keep the mufflers on the car at all times. A couple of months ago in 5.0 magazine (I don't remember what issue), but they dyno tested 15 different mufflers and also tested it with out mufflers. HP and Torque was much higher with any of the mufflers over the straight pipe set-up. Also straight pipes will be obnoxiously loud.
I ♥ Acer
Joined: Mar 2003
Posts: 2,199
From: United States
2000gt straight piped
<blockquote>Quote: Originally posted by MastyrLock on 13 April 2003<hr>
Thanx but i was told back pressure helps at the bottom end
<hr></blockquote>
Wrong. The reason this myth continues to live is pretty simple. When you eliminate backpressure, you increase the exhaust velocity. With me so far?
Now, when you do this, it changes the torque and horsepower curves. It moves the peaks higher up in the RPM range usually. You can use different length pipes, bends and dia's. to tuen the exhaust flow for peak power at a certain RPM.
Larger pipe=less backpressure up high, lets the engine breath.
Smaller=opposite, but chokes it once you start reving more.
The optimum exhaust system for any internal combustin engine is a high velocity, zero back pressure system. This is almost impossible to acheive for every RPM though with one system, which is why I personally like larger piping.
Thanx but i was told back pressure helps at the bottom end
<hr></blockquote>
Wrong. The reason this myth continues to live is pretty simple. When you eliminate backpressure, you increase the exhaust velocity. With me so far?
Now, when you do this, it changes the torque and horsepower curves. It moves the peaks higher up in the RPM range usually. You can use different length pipes, bends and dia's. to tuen the exhaust flow for peak power at a certain RPM.
Larger pipe=less backpressure up high, lets the engine breath.
Smaller=opposite, but chokes it once you start reving more.
The optimum exhaust system for any internal combustin engine is a high velocity, zero back pressure system. This is almost impossible to acheive for every RPM though with one system, which is why I personally like larger piping.
I ♥ Acer
Joined: Mar 2003
Posts: 2,199
From: United States
2000gt straight piped
It's all in tuning it for the RPM range the engine will be run in.
Just because the 2.5" piping seems to be best for street drivin stangs, it won't for a 302 blown alcohol sucking dragster that runs at high RPM's. See what I'm saying now?
The backpressure myth is just like burning out valves with open headers. It doesn't happen.
Just because the 2.5" piping seems to be best for street drivin stangs, it won't for a 302 blown alcohol sucking dragster that runs at high RPM's. See what I'm saying now?
The backpressure myth is just like burning out valves with open headers. It doesn't happen.