Congrats..!!!

Love this AWD build soo far..

~ Joe Z

 

Hey could you post a video after adding the resonator . I am getting the invidia axle back and wanna do a custom mid pipe . Do you recommend gt custom exhaust Pickering ? How much it cost you ?

 

Got my RS*R Downs installed...


Rear Gap (Basically flush)



Front Gap (1.5 finger gap)

 

Where did you get the F-Sport rims?

 

I got them from a friend. He got them from Sewell shipped to Toronto.

 

Lots done in the 5 months since I posted.

I'll slowly update...

Finally have some free time to post some thoughts and experiences with modding the 3IS stock exhaust. Got the car in January and I was always looking for that perfect sound while retaining a bit of the Lexus persona of being a comfortable and relaxing daily driver. A couple thousand dollars later , with dozens of trips into shops for my own R&D, I can safely say that I have reached my goals.

This thread will be updated, but first, a foray into the exhaust reiterations.

Version 1:
Done: Secondary cat and resonator delete. Replaced with aluminized tubing.

Result: Not much different sounding, not a lot of drone. Sound generator seemed throatier. Was hitting subframe as pipes were not done meticulously. Shifted entire exhaust system.

V2:
Done: Added Joe Z axleback

Result: Super loud, raspy. Intolerable cabin drone but the car sounded beast. Lots of crackles and burbles and pops.

V3:
Done: Added in dual 18” GT Speed T304 resonators (basically Vibrant).

Result: Balanced sound, eliminated 95% of rasp, reduced drone by 80% but still noticeable around the 1,800 to 2,200 RPM range.

V3.5:
Done: TRD Diffuser warranted quad tips, so stock Joe Z tips cut.

Result: No difference in sound with added T304 3.5” quad pipes.

V4:
Done: Replaced all tubing O2 sensor and behind with T304 stainless steel. X pipe to even out flow and promote increased backpressure for increased torque. V-band clamp quick connects to eliminate gasket exhaust leaks. Custom T3404 Helmholtz resonators to greatly reduce 1,800 to 2,200 RPM drone.

Result: Much more even idle, no more machine gun putting. A more mellow and smooth sound reminiscent of the IS F or Infiniti VQ exhaust. I’d say droning is reduced about 100x from V2 setup.
Low-mid load sound reduced significantly  (I’d say around 50%). High load and WOT about 20% reduction in sound. Drone at 2,200 rpm is now barely audible and reduced from V3 setup by about 90%. No more droning in the cabin causing vibration. In city acceleration and driving is more manageable.

X Pipe:





Resonators:



V band clamps:



Joe Z Quad tip axleback with a drone tube/1/4 frequency resontor/Helmholtz resonator:



Videos:

 

Are these bulbs any brighter than stock?

 

@ultan00b8 love the setup, which quad tips did you end up using to weld on the joez exhaust?

 

Sorry for the very late reply. No, they're not brighter than stock as the 4100k bulbs give out the most lumens, but they appear brighter and whiter.

The shop had some T304 dual tips to choose from. No idea where they came from.

 

Interesting.

 

question...so after installing the springs (assuming you did an alignment) with the fender sitting flush on the rear tires, did you have to adjust/modify the fender well? is there any rubbing...with or without passengers? I mean it "sits" perfect, but was curious what it's like when driving.


I like those 19" f sport rims as well.