Help w/American Thunder 40 Series Exhaust

[James Lyons]

I am new to this site, but I have a few questions.
I have a 2001 Cobra convt, does anyone know if the numbers of 320 hp/317 lbs that ford publishes is correct for this vehicle?? I alos just had Bullet Exhaust installed on it, and it is really loud in side the car and even louder outside, I have not been able to find any info on this exhaust system. I had it installed by a muffler shop, who stated that it sounded way better than flowmaster or borla, I need any info on this if anyone has any to vide thanks, James

[IBleedBlue]

I went ahead and put the 50 series delta flows on my Mach and replaced the 40 series. Very satisfied. Cut down greatly on the interior resonance. Didn't feel much difference in performance except that I might have lost a little torque feel. Which is kind of interesting as you would think I would actually gain a little torque. Flowmaster web site bascially says not much difference in flow between the two but lot less noise.

[Orange97GTVert]

Originally Posted by IBleedBlue

I went ahead and put the 50 series delta flows on my Mach and replaced the 40 series. Very satisfied. Cut down greatly on the interior resonance. Didn't feel much difference in performance except that I might have lost a little torque feel. Which is kind of interesting as you would think I would actually gain a little torque. Flowmaster web site bascially says not much difference in flow between the two but lot less noise.

IBleedBlue, is your Mach a 5 speed or AOD? I really want a catted X, I think I can handle it with the 50 series I have now, but I have had this inside roar problem on mine (and on my Silverado, you should have heard it when I first put Flows on it) and I am on my 3rd set of Mufflers, I like it but I want a little bit more sound without getting the interior roar back.