Pat is right. Though I went with the offset/offset. Not finished yet, but the hard part is resolved. I think the offset/offset minimizes bends and makes the install easier. Clearance considerations: rear sway bar for height, the rear frame post at the exhaust exit and the diff housing at the rear. I don't think any of the OE hanger posts will work because of the muffler size and position. SST Note: pipe type jack stand with a hole drilled and nut welded to it for infinite adjustability- awesome for exhausts built on jackstands.
I've got 2.5" with a cheap "high flow" ebay cat and a straight through 18" magnaflow muffler. It's louder than stock but it's very deep and doesn't drone at all. I love it. It sounds a lot like most of the others here.
Fits nicely with minimal bends and it IS quiet at idle and low rpm. Have yet to romp on it- still more stuff to do while the car is up. Here's install pics and a vid with some idle and low rpm revs.
I used one of the rear tie down posts to bolt up some plate with a hanger stud on the end. Makes for easy install/removal vs. pulling the hanger.
Used the stock hangers on the exit side by just bending them up.
A little over an inch clearance at the diff case and sway bar at the closest point.
Yeah- it's quiet, but there is a deep tone that isn't making it on youtube. This is with a 3" from the internal wg housing all the way back, 200 cell metal cat and 18" glass pack with the louver openings facing oncoming exhaust.
There's the 14589 (center/offset) and the 12579 (center/center) which are also 6x12x22.
Magnaflow doesn't appear to offer any 6x12 ovals. If you check out the Magnaflow site 12578 is listed as a 5x11x22 inch oval. ...but, I've never had my hands on one so I can't vouch for the actual dimensions.
I didn't measure the can, just lifted the specs from p-peddler's site. It's big either way, but it does fit with minimal bends regardless of size. Though I think you'd have to go with the offset/offset for the area round the diff. Build it w/o the glasspack and if it's too loud add it in. It was already welded in from the previous setup so I left it in... for maximum hush.
this thing is incredibly quiet at idle, daily driving and under load = awesome
I did a rear shot in an effort to get some audio- all the rattles and squeaks in my car are louder than the exhaust.
Here's a 1-2-3 roll on acceleration with lots of wheel spin- I even rolled into the throttle in 2nd but as I got the pedal down the tires still broke loose. It's just too cold for traction right now. That's followed by steady state hwy cruise and then a 4th gear run from <2k to just under 7k rpm.
You know, I must admit my exhaust got really really quiet after putting the turbo on. I really wasn't expecting this big of a drop in noise. It's very acceptable, and I'm picky on loud exhaust. Mine is a touch louder than stock at any RPM or load.
I'm thrilled. I gotta say I was skeptical even though Y8s and Jason testified to quietness of the big one, but I'm a believer now. Not quick enough.
Yeah, mine's probably as quiet or quieter actually. Turbo, 2 24" lourved glasspacks, then a 27" lourved glasspack, then a 18" core Magnaflow and 3" out the back (will eventually be a 2.5" tip). All glasspacks with the lourves pointing for maximum drag.
And for the "not quick enough" part: I so gotta build a motor.