True on the spacer.

Question is,

What is the big difference between the 1/2 and the 5/16?

I think, the 1/2 gives more towards the high end? Where as the 5/16 is more balanced?

Dont have an exact answer as to what it is.

 

They are effectively the same as there is a less than 10% difference between them! But 5/16 for price and DAily DRiving.

 

Go to Motordyne's site and read up on it. All the info and stats you need are there including dyno runs.

 

Ok so this kinds fits in the thread... well sorta... So I swapped out the Cabin filter WOW was that one NASTY. It was not too bad to install but still a high pucker factor when popping off trim panels lo. The AC and other climate functions actually work better go figure.l. I also swapped the generic air filter with a Purolator PureONE. and seemed to picked up a little bump in mpg... woohoo win win! SO one the stupid heat shields on the Ypipe was rattling so I fixed that. While under the car and looking around I got a good up close look at the sedan mid....HOLY CRAP that thing is HUDGE! I knew it was big from some photos but OMG that's crazy...looks like it must weigh 50lbs or something. It is also starting to get flange cancer at the Y but the y itself and rest of the flanges look great. So what's the best option for a 35X pick up just a resonator and have a shop make the rest? or get a full new OE replacement mid such as a Walker or a used coupe pipe? is a used mid asking for trouble in longevity ?