Yeah, I really doubt they would fit without at least some tweaking. The Wheelz tips actually get wider towards the end where the pipe attaches, and as you move them out, you quickly run out of clearance. I wanted them to extend as much as possible, but I found that I really didn't have the room I needed. The minimal clearance made them rattle. What I ended up doing was to rest the lower edge of the tip against the lower edge of the opening. I cushioned it with plastic door edge molding. That allowed a decent amount of extension and enough clearance up top so they didn't rattle.
Just for clarification, the 17222 and 17749 are two completely different style mufflers. 17222 is an 'Ultra Flo', while the 17749 is a 'Super Turbo'. The Ultra Flo is a perforated tube straight-thru muffler, and is just about the highest flowing muffler on the market. Racers love them, F.A.S.T class racers use them, but they are NOT quiet. That particular 17222 muffler will support 910 HP before any loss in power is noticed. Dynomax refers to this rating as "Loss Free HP", and there are several 3" models that will support 2000 HP. The 17749 muffler that you had is the longest of the Super Turbos (20") and the quietest. It will support 386 HP before any power loss is noticed. It is an awesome street muffler. The Super Turbos were originally designed by David Vizard and rolled out under the 'Sonic Turbo' name. After Walker bought Cyclone, the name was changed to 'Super Turbo'. The internal 'Flow Directors' eliminates the turbulence as the exhaust reverses direction twice to pass through 3 internal flow tubes. It's a very efficient street muffler. For comparison sake, your typical 2.5" 40 series Flowmaster will support around 340-350-HP before any power loss is noticed.
Good info CMCE. My 17222 mufflers are comparativly quiet after listening to my friends flowmasters (awfull noise) even though he has an x pipe. I have an x pipe that helps my Walkers, but there is no "drone" at any speed. Their perfect for me. Maybe the pading under my carpet is making them "quiet"!
Gary, if you want more specific information about Walker Dynomax mufflers, I've provided a spec sheet for all of their mufflers here- https://classicmusclecarexhaust.com/i/exhaust-101. There's a link in the Dynomax section that gives the SCFM and HP levels of each muffler. One thing though, that 'Loss Free HP' rating is NOT the HP limit of the muffler. It's the upper level at which the muffler has NO affect on HP. It's only after that rating does the muffler start costing HP. As far as Drone goes, it usually happens in the 1800-2300 RPM range, and there are many factors such as engine combination, exhaust tubing diameter, and muffler design that add to it. Generally cars with axle ratios in the 2's to lower 3's suffer more because the gearing puts them right in that RPM range while cruising. Factory mufflers are designed to eliminate it, but it's not the top priority for most aftermarket high-performance mufflers. Some do a good job with drone, some do not, but it all comes down to engine/gearing combination.
Although I've had customers say the opposite on occasion, that is generally a very true statement. Remember though, MagnaFlows come in 4 different case lengths, 14, 18, 22, & 24". All same design, just different lengths. I've heard the 22's sound just slightly louder than factory (but with a completely different tone) on a stock 318 engine, and I've heard the 14's nearly rattle the fillings out of my mouth on a radical BB Chevy. There are so many factors that determine the sound of an exhaust system.
I have the 14264 Magnaflows, case length 18", overall length 24". I have no drone at all and the GV OD puts me right at 2200 RPM at 60 MPH. https://www.summitracing.com/parts/...MImtGDh6bA5wIVUPDACh39xQviEAAYASAAEgL0OvD_BwE
Yeah, it's rare that someone complains about drone with MagnaFlows. I would have to think that it's their Stainless mesh and 'Acustic Fiber Fill' that kills the drone. There are plenty of similar straight-thru designs out there, and not all are as resistant to drone as MagnaFlow.