What's the best performance exhaust combo?
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From: Flagstaff,AZ
1987RX7guy, I haven't contacted your buddy yet, I've been so busy trying to find out what system to use. Everyone hasd a different opinion about what one should do. Anyway, I'll e-mail him later to ask him if he still has it. Do you know why he is selling his system? -Steve
Originally posted by rotarygod
For a stock port rotary the true duals is fantastic. It gives a wonderful horsepower increase as well as better gas mileage due to greater low end power. It just sounds terrible. A streetport that has the intake closed later and the exhaust opening earlier would probably get similar results. My streetport has the intake opening earlier as well and also the exhaust port closing later. This greatly increased port overlap and now a collected system becomes very important. I just removed the Racing Beat streetport long primary system and installed a custom fabbed setup that is a short primary system. It sounds backwards but I wanted to sell the system and I have parts lying around such as a header. The new setup should actually make more power since it is done in a completely different way. The Racing Beat system uses 2" pipes all the way back to the muffler. This makes no sense here but the pipes going into the muffler are 1 3/4". There is no transition to this size either. Just a big airflow restricting lip. I ground this down to a nice transition but there still isn't the flow area I want. Some guys completely refab this section. The 2 pipes then collect to a common 2 1/2" primary just before the entrance to the muffler. My new system uses a short primary system (uner 24" long) which collects into a 2 1/2" collector. It immediately hits a short "megaphone" and expands to 3". From there it runs back all the way to a Warlock muffler. It will be finished later today but judging from all of the different exhaust systems I've had over the years this should work superb! Oh yeah, despite all the bad criticism Pacesetter headers aren't all that bad. They just need a better collector.
For a stock port rotary the true duals is fantastic. It gives a wonderful horsepower increase as well as better gas mileage due to greater low end power. It just sounds terrible. A streetport that has the intake closed later and the exhaust opening earlier would probably get similar results. My streetport has the intake opening earlier as well and also the exhaust port closing later. This greatly increased port overlap and now a collected system becomes very important. I just removed the Racing Beat streetport long primary system and installed a custom fabbed setup that is a short primary system. It sounds backwards but I wanted to sell the system and I have parts lying around such as a header. The new setup should actually make more power since it is done in a completely different way. The Racing Beat system uses 2" pipes all the way back to the muffler. This makes no sense here but the pipes going into the muffler are 1 3/4". There is no transition to this size either. Just a big airflow restricting lip. I ground this down to a nice transition but there still isn't the flow area I want. Some guys completely refab this section. The 2 pipes then collect to a common 2 1/2" primary just before the entrance to the muffler. My new system uses a short primary system (uner 24" long) which collects into a 2 1/2" collector. It immediately hits a short "megaphone" and expands to 3". From there it runs back all the way to a Warlock muffler. It will be finished later today but judging from all of the different exhaust systems I've had over the years this should work superb! Oh yeah, despite all the bad criticism Pacesetter headers aren't all that bad. They just need a better collector.
Actually I DID have the true duals once. They do sound terrible (in my opinion). I didn't meet anyone that liked it. If you like it then thats all that matters 
It (mine)went from a wonderful F1 type of sound to something along the lines of a blown up lawnmower engine crossed with a Harley Davidson. I didn't mean to offend anyone with that statement. Mazdatrix describes the sound as "useable".
The new exhaust is done and running. Started a new thread in the Rotary Performance section to post the results.
It (mine)went from a wonderful F1 type of sound to something along the lines of a blown up lawnmower engine crossed with a Harley Davidson. I didn't mean to offend anyone with that statement. Mazdatrix describes the sound as "useable". The new exhaust is done and running. Started a new thread in the Rotary Performance section to post the results.
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