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Just picked up some Magnaflow 14325 mufflers for the RX yesterday! This is one of the final pieces of the puzzle before I can start building the system!
✅ Headers (Weapon R - #953-204-121)
❌ Catalytic converters (2x 8" Magnaflow cat 2.25" in/out - #53955)
✅ 02 bungs (M18 x 1.5)
❌ Front pipe bank 2 (Needs to be custom made and enlarged to 2.25")
❌ Rear pipe bank 1 (Needs to be custom made to fit rear header)
❌ X-pipe (Needs to be custom made or bought)
✅ Middle resonator (22" oval resonator 2.25" in / 2.5" out from 2015-2022 Mustang GT)
✅ Rear mufflers (2x 14" Magnaflow muffler 2.25" in/out - #14325)
✅ Exhaust tips (9" angled tips w/ chrome finish from 2011-2014 Mustang GT)
After measuring the area, these are about the largest mufflers you can fit in the area with the spare tire in place. The location of the pipe inlets & outlets allow you to stuff some more of the muffler behind the bumper for some extra muffling vs the coffee can stock resonator. Any longer and they'll stick out too much, any taller and they'll sit too low, and any wider and they'll contact the spare tire and bumper sides. Just right! Unlike the stock setup, I am relocating the mufflers to the rear of the car like a 2001-2003 Highlander or 1999-2003 RX300, and moving the resonator to the middle of the car. Our cars have a little round "can" resonator out back but a massive baffled oval muffler in the middle. You can run slightly smaller mufflers (Like what the 01-03 HL and 99-03 RX do) if you make up for it with a larger resonator. I will be using some of the unused (possibly trailer hitch) M10x1.25 bolt holes on the driver's side of the car to mount a custom exhaust hanger to hold the driver's side muffler of the dual exhaust.
If this goes according to plan like the Highlander, this exhaust system will flow a heck of a lot better (in this case WAY better than that), look a lot nicer, give me some more sound without being too loud or drone-filled and have less bends while tucking away closer to the frame to save over 1" of ground clearance. Using the flatter oval mufflers at the back vs the stock can resonator helps too, but the major one is the muffler in the middle which is twice as tall as the new Mustang one going in! I was originally going to run dual Vibrant 1105 or 1129 15" mufflers out back, but I found the Magnaflows locally for just too good of a deal to turn down.
I got lucky! Oh.. not that way - hah! EXHAUST: The guys at JC Muffler, Oregon USA really did some nice work for me. When I told them my brother used to race dirt bikes (they do race stuff too) and I had seen pictures of the squashed together oem Y pipe on this forum - they cut the old one out with a saw and brought it in to show me!! Studying the pictures I took post install -- they really did a lot of quality work (welds and bends etc) for the measly fee they charged me. I think this is the mother of all 3.3 Y pipes(!): 2.5 in 2.5 out. Wow! They combo'd it with a Borla muffler and the stock resonator (unfortunately I neglected to fully absorb info from MattRX on muffler choices - but luckily I would not go with a straight-pipe without really knowing what I was going for, and I think(?) they made a pretty sensible choice. The guys said this would help wake it up, and it has certainly has. I think this has really changed the character of the engine - which in turn has changed the character of the whole car for me. I have a K&N filter which also made a difference (I will run the Purolator filter when I work/camp/drive in dusty forest service roads - thanks MattRX for the filter post). Initial observations: noticeable audio and throttle difference, while not being too loud (very subjective). I got the audio feedback and pedal connection I was hoping for (my first v6). The exhaust sound is a little gurgly in spots on the low rev(?) but it can be quiet-cruising or give you a responsive tone/feel with a downshift etc. Not too bad at start up with noise for neighbors or off from a stop light. It could be a hair quieter,smoother? I will have to live with it to see. It may not be that much louder than stock - at this point I am hard of hearing anyway. I think my mom (who loved the muffler sound on the old 240z) would approve - but this set up is a little more aggressive still. Here is a pic of that lucky-score-Y-pipe. Looks bone stock from the back.
Oh, Wow, the work those guys did for you looks awesome. This what I need to do next.......Little ways down there, thou.
Here is my RX400h on coilovers with RC-F Wheels 2008 RX400h fwd lowered on coilovers, 19x9f 19x10r RCF stock BBS wheels. spacers needed to clear coilovers.
Thanks Matt still working on suspension adjustments, I had to roll the rear fenders because I would hit a big bump and shred the rear tires. Rear tires are 285/45/19 and fronts are 255/50/19 fronts they are approx the same height as the stock 18" tires. Takes turns a hell of a lot better!
Last edited by NickyBlackRCF; Oct 11, 2024 at 10:50 AM.
Finally got my hands on some coilovers! One of my coworkers had an RX330, and promised to sell me the coilovers before selling the car - now they are in my hands! They're BC Racing BR series. These are a couple years old and not perfect, but seem to be in pretty good condition overall and I am excited to try them! All four dust boots are ripped up and the springs have some rust, but I might want to go with some stiffer springs anyway.
The spring rate is 6k front and 3.7k rear, which seems really soft to me, so I want to try running them first any maybe picking up some stiffer 8k & 6k springs or maybe something even stiffer later. I test-drove the car and it felt almost as soft as stock. I can also play around with the damper settings too and that might help - we'll see. I like how firm my Eibach springs are, but I probably won't need to go with something that stiff if the car is going to be sitting lower. I really don't want to lose my ability to shove 1000+ lbs in the trunk and the car to barely sag - however!
For anyone wondering. The front dust boots are 150mm long and have a 50mm OD and a 22mm ID for the rod, the rears are also 150mm long and have a 20mm ID. Bump stops are 40mm long and have a durometer rating of 70a. It seems that most of the individual pieces are sold by BC, but the rear springs are special as they're not a universal coilover spring and they reuse the stock rear mounts. The fronts are 62-240-6 (62mm ID, 240mm length, 6k spring rate), the rears are 280mm long and are 62mm ID at the base, but get progressively wider near the top to match the contour of the strut mount. I want to make some custom all-steel rear mounts that use a straight 62mm spring, to open up my options for other springs.
Got them in today! They're stiffer than I was expecting despite being 6k front and 4k rear. I have the dampening set to 15 (middle) just to get a feel for them for now. The ride quality is similar to the Eibach springs, although big bumps are a bit more harsh, but smaller ones are handled better. Might have to stiffen up the front a bit, as 15 up front doesn't feel as stiff as 15 in the rear. The Eibach springs feel a bit stiffer, but you can tell they were on shocks (Sachs) with noticeably softer valving.
Body control is nice, there's even less nose dive and squat now - and the car feels even more settled and planted in a corner, with less travel it feels like it wants to pick up a wheel! The fronts being solid mounts have better steering feel and response by a little which is much appreciated, but that comes with a small NVH hit - albeit a minor one. Not going to bug someone like me who prefers something with a stiffer / sportier ride.
