ma3o

Here is my 2021 RC350 AWD F Sport in Caviar Black:


I'm a huge fan of the 2019+ facelift.

Current Mods:
RR Racing Road & Track R2 Coilovers
RR Racing Street USRS LCA Bushing
F-Sport Performance Exhaust
RC F Aluminum Shift Paddles
RC F Puddle Lights
Uniden R8 Radar Detector (Mirror tap + Blendmount)
Spacers: 20mm Front, 25mm Rear

PeteinPA

iTrader: (2)

Car looks great. Question on the exhaust did you also have to change the diffuser? I have a 2023 and was under the impression that if you go with the Fsport exhaust you need to change the diffuser as well.

ma3o

After having both the coilovers and USRS LCA Bushings installed at RR Racing in Pennsylvania about six months ago, I've had plenty of time to appreciate their pros and cons.
Before the coilovers, the car felt severely under sprung and underdamped, even in Sport Plus mode. This meant the ride comfort was great, but the car would roll all over the place and dive hard during braking. This was especially noticeable on track, and felt like you were fighting the car through every corner:


Stock suspension on track: body roll galore



At RR Racing

First, the pros:
- Body roll is basically gone: The car handles flat and responds much quicker to steering inputs. The car doesn't wallow through high speed turns anymore, the dampers do a good job of keeping the car composed during mid corner bumps.
- Steering feel: Driving along at city speeds I didn't notice a huge difference in steering feel, but when driving at highway speeds or closer to the limit you can definitely feel more of what the front tires are doing. The steering felt completely disconnected before. I had both the RR Racing coilovers and USRS installed at the same time, so I'm not sure which one of these made more of an impact. Also the USRS solving the inner tire wear issue is a great bonus
- Adjustability: There are 24 clicks of adjustment on the dampers, and every click makes a difference. You really can adjust them for comfort, or sport/track duty. Not something that can be said about the stock "Adaptive Variable Suspension".
- Lowering: the car sits at the perfect height for me now, but if I ever want to go lower I have the option to. One side effect of fixing the monster truck front gap was that the wind noise and turbulence at triple digit speeds was massively reduced.

The cons:
The aggressive 16k front and 14k rear spring rates make the car rough over broken pavement, especially at low speeds. RR Racing does offer softer spring rates but I wanted max performance. Lol.
However, the offsets of the stock wheels are super conservative, allowing for a 20mm front and 25mm rear spacer to be added. After the installation of the spacers, the car changed completely. The suspension felt far more compliant and almost as comfortable as stock. From what I understand, the addition of the spacers increased the wheels' leverage on the suspension, lowering the effective spring rate. This could be completely wrong, but the difference was so night and day that it was the only theory I could come up with. I assume the same thing will occur when I add wheels with a more aggressive offset, which I plan to do in the future (Apex EC-7 18x9.5 +35).

ma3o

You don't need to change the diffuser, the F-Sport Axleback will fit without any mods. There is no matching diffuser for the 2019+ models, so you just have the round tip in the stock triangle-ish shaped exhaust outlets. Looks a little bit funny, but I like that you can see the stainless mufflers from the back.

B14CK1iN3

There IS a diffuser made by TRD which can be bought together with the OEM F Sport exhaust or separately if your RC has the single tip F Sport exhaust. It is the only diffuser that I’m aware of for the 2019+ models.

ma3o

Yep there is a 2019+ TRD diffuser for $2,000, but it still looks like it works better with dual exhaust

the pre-facelift f sport diffuser is $100 (PTR54-24150) so I might get one and cut up the exhaust surround and stick it on the stock bumper insert.

raspresso

Build looks great! I just got these coils installed on my RC350 AWD -- but have been dealing with some very subtle clunking/clicking sounds coming from the rear ever since installing. Have taken it back to the shop that installed them several times to check that everything is bolted down to torque specs, etc -- but haven't been able to figure out where the noise is coming from. I'm wondering -- do you deal with any noise at all? Mine is only noticeable at low speeds, because it is so subtle, once youre at speed you cant hear the noise over the road/wind/exhaust noise.

Thanks!

ma3o

I’ve recently noticed some sound at low speeds too, wasn’t there when it was first installed. If everything is torqued then I’m not sure, maybe the coil is rubbing against the fender liner? Sway bar end links? If you find a solution please let me know

TheHummus

The build looks awesome ma3o! Quick question on the exhaust, do you happen to know the part number for the FSport exhaust you installed on the RC? I know there is an FSport exhaust for both the IS and the pre facelift RC, and I believe they are slightly different, as the part numbers are different, if I’m remembering correctly. Just curious if you got the exhaust meant for the IS or pre face lift RC installed on your 2021 RC.

ma3o

I don't recall the exact part number, but I ordered the exhaust after they had discontinued the RC350 specific pt#. The parts guy seemed pretty sure they were the same exhaust

RA051724

Gawjus mate! Luv it.

ma3o

Ordered some new wheels, track edition/bbs inspired. 19x8.5, 19x10. I’ll post updates when they arrive.

ma3o

Thought I’d share a pic from the factory, painted and ready to be shipped

blackbond

cant wait to see these installed. where did you get them?

ma3o