3.0" to 2.5" Exhaust - Bad flow characteristics?

[Earful]

He said downpipe.... I agree with him, the downpipe is stupidly expensive. Its $785, which does seem extremely expensive

Ditto....although this piece is nice....it is overpriced.

 

[yashart_mp3]

Ill share what I know...

We did some dyno runs with a 3" thermal exhaust vs the stock exhaust. Only mod on the car was an Injen Intake...

These dyno runs were taken on a mustang type dyno, its acutally a clayton. So the HP #'s are going to be less and the torque #'s are going to be higher.

3" Thermal Cat-Back Exhaust w/ Stock Cats
Max Torque = 205.3 @ 5000 rpm
Max HP = 141 @ 5500 rpm

Stock Cat-back Exhaust w/ Stock Cats
Max Torque = 208 @ 4950 rpm
Max HP 143.6 @ 5700 rpm

3" Thermal Cat-Back Exhaust w/ No Cats 2.25" Mid Pipe
Max Torque = 222.3 @ 4700 rpm
Max HP = 154.4 @ 5850 rpm

Stock Cat-Back Exhaust w/ No Cats 2.25" Mid Pipe
Max Torque = 214.8 @ 5000 rpm
Max HP = 151.3 @ 6100 rpm

Wow, I guess I overlooked this or didnt really think about it too much. From your dyno runs, it looks as if the stock cat-back section really isnt all that bad. It dyno'd about the same as the 3" thermal catback.

From your runs, the stock cats/ midpipe seems to be the real restriction in the MSP exhaust setup. I guess I will be picking up a midpipe/downpipe first now.