How longs the magnaflow? And any gain in performance?

 

just put on a performance curve 2 chamber, and dumped it sounds sweet!!!

 

I'd do only one pipe. That way it'll sound nice, and you wont be a dual exhaust faker. Whenever I see single in dual out, i look upon that vehicle with shame.

 

How is that fake? Both pipes are functional, exhaust actually comes out of both. Believe it or not, it actually sounds different than a single exit as well. I see your Blazer has no cat, that's a federal offense and you're polluting the air, should I look upon your truck with shame?

 

A single in/dual out system can actually add torque and increase mileage - IF the system is properly designed. I've been considering a single in/dual out system and discussing it with my friend at the muffler shop for a couple of months now. In the end I didn't want to invest the money into the system, so decided to go with a Gibson cat-back system instead. I'll be installing it this weekend. It may not be as loud as the Flowmaster or Magnaflow systems but when comparing specs it did show the greatest torque gain under 3500 rpm versus the other systems. I could never understand why you would want a loud exhaust anyway. Loud does not always equate to performance gain. All it does is attract attention...usually the wrong attention...like the police. I've always built my vehicles with the quietest exhaust possible. That way I can utilize it's power without drawing the attention of the local law enforcemnt. The only time my vehicles are loud is when I uncap the headers out at the track.

 

I consider dual exhaust two separate pipes running all the way back, not meeting in a Y-pipe. And to be honest, not having a cat isnt bad.

 

First not having a cat is a federal offense and having a single in dual out not only looks good for the vehicles that dont have the room but you can absolutely get more out of it along with more sound. You have to realize most tractor trailers with dual stacks are y piped from the turbo back, Keep 1 pipe the perfect medium to keep low end and large enough to flow at higher rpms and then 2 smaller pipes for the look and the similar affects of duals from the muffler back now with 2 pipes pushing out the exhaust. If i had the room to run duals i absolutely would but i dont so on my next truck it will either be dual out or true dual.

 

Back in the 70's a "true" dual exhaust system (seperate piping from manifold to tailpipe) was commonplace, but the manufacturers quickly caught on to a little trick that was being used at the race tracks. That trick was to add a H or X crossover pipe behind the collectors. The addition of this crossover pipe increases hp/torque by balancing out the exhaust pulses (hence the name "balance tube" that is now common) which improves cylinder scavenging. It was also discovered that you can move the hp/torque increase up/down the rpm range depending on how far downstream the crossover pipe is placed. A dual exhaust system with a crossover pipe is still a "true" dual exhaust. In fact, it is more efficient.

 

I call duals with no crossover "divorced duals" because they're separated and they never come together.

 

mine has a mach 1 muffler with the dual exhaust and it sounds pretty beastly too.