View Single Post
Old 02-25-2012, 06:33 PM   #3 (permalink)
Master EcoModder
mcrews's Avatar
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 659 Times in 474 Posts
One of the basic myths is "it will flow better with XXXXXX (insert larger pipe 70% of the time).
Since we are ecomodding, we are trying to use the engine in the lower rpms. There is NEVER a time when a larger than factory size will be beneficial.
Thanks for providing the exhaust pipe size chart!
On my particular car, (02 infiniti Q45) there was a very large muffler in the rear. commonly refered to as 'the suitcase muffler'. It wieght about 40lbs. There were already 4 cats, 1 resonator and 2 mufflers beofre this last one. I removed it PRIMARIALY for some weight savings.
I could see where someone (with an older car or a top of the line car) could reduce some weight and still have a relatively quite exhaust. as long as they keep the piping at factory size.
here are some pics:
I have removed tj=he rear dual muffler and installed minis

I di remove the resonator...there was a crack developing and installed the x pipe.

that lead into the factory mufflers:

The rear is covered now with a rear belly pan
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

First: ScangaugeII

Second: Grille Block

Third: Full underbelly pan

Fourth: rear skirts and 30.4mpg on trip!

Last edited by mcrews; 07-16-2012 at 11:29 PM..
  Reply With Quote
The Following User Says Thank You to mcrews For This Useful Post:
brent777 (02-19-2013)