Yeah, the pipes are 2.25 OD from the cat back on the single outlet system. So a 2.5" is a nice increase in area, but not too much for my stock v6.
All the other systems I had on other cars gave about 1-2 mpg increase on highway driving, but they were all custom systems.
I remember reading a doc from Magnaflow claiming 10hp and up to 3 mpg on the V6 cat back, but now I can't find it. The 3" version (same configuration) used on the V8's gives has a dyno sheet on their website showing 18hp and 15 torque gain. If the V6 does half of that, I would be impressed. They do claim:
Quote:
Question: How much horsepower can I expect to gain?
Answer: It's different for every car, but typically expected gains are in the average range of 10%.
Replacing the muffler/exhaust with a MagnaFlow will help your engine increase power by being able to expel exhaust gases quicker. This creates less workload for the engine, makes it run more efficient, and results in better power.
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"Average Range" being the operative words......
I sent Magnaflow an email asking for the V6 dyno sheet(and any mpg info), seeing as they claim every design is dyno tested to ensure HP gains. We will see what they say.
They also had this interesting bit of info on pipe sizes:
I was surprised to read this on the Magnaflow site. Its classic "old school" exhaust sizing, where today it seems that many people think you can't get big enough pipes. Nice to see some rules stand the test of time.