Magnaflow 16665 (5.7 Hemi) review
I had a PM asking for some info on the exhaust in my sig. I figured after replying that I should maybe put the review up for all to see. Here it is:
My exhaust is 16665. My Hemi is a two wheel drive, not sure if it's the same exhaust for 4wd, but it probably is. It looks good, and sounds good. It's a much deeper tone than stock, and typically deceptively quiet. When you push 3k rpm, it starts to roar pretty dang loudly - I have a feeling at that rpm the roar is so loud in part b/c that's the area where my cold air intake would roar before i installed the exhaust. At wide open throttle, it'll turn heads like a souped up old GTO prepped for the drag strip. Other than that it's silent at idle once warmed up, and only noticeable if you know what to listen for when cold.
The only time I notice it when on cruise control is if MDS is popping on and off when on the highway. It's totally silent on cruise at 70 or 75 while running on all 8, but slightly noticeable when it bounces down to 4 cylinders. During what i consider to be normal and easy acceleration, it sounds virtually identical to most ram pickups with hemi's.
Installation is cake. Quite literally just lift it into place, push the welded hangers through the oem rubber hangers, then torque it all down (only three bolts). It attaches to the flange just behind the catalytic converters similar to how the oem exhaust does. The oem exhaust has two welded bolts, and the magnaflow has two true bolts instead. There's a compression sleeve that connects the rear resonator assembly to the forward muffler.
Much more difficult is getting the old exhaust out. I had to use a sawzall with a metal cutting blade (similar to a fine toothed hacksaw blade) to cut between the resonator and muffler in order to get it all out. I'd recommend doing this on a lift or with jackstands (not on the rear axle, but on the frame) so that the rear suspension isn't in compression. It'll give you way more room to wiggle the bent pipe from the oem setup out the back. If you do it on ramps like I did, that wiggle is truly difficult.
Unlike the oem exhaust, the tip doesn't point down at all, so clearance at the bumper is pretty slim, maybe a quarter of an inch. I've thought about extending the stock cutaway more to accommodate the new tip with more clearance, but haven't done so yet. I'm about half a thousand miles into the new exhaust, and there's no evidence of heat damage or physical banging to the plastic of the bumper yet so I'll probably just leave it alone.
Oh, one more thing...the first thing you'll notice after you install the new exhaust and take it for a test drive is the smell. It'll take a good half hour of driving to burn off the polish on the pipe sections, and it stinks. The muffler, resonator, and tip all stay a pretty polished stainless though, but the pipe sections will noticeably darken. It looks better if you make sure to wipe it down before starting it up after installation so fingerprint oils don't get burnt in.
I'd send pics but it's dark out now and I haven't snapped any yet.
2008 Commander LTD, 5.7L Hemi, AFE Cold Air Intake, Magnaflow Cat Back exhaust
Last edited by chriscavell; 09-02-2011 at 06:23 AM.