Basic rule of thumb for stage 2 is:
Cold air intake
Intercooler
Decat
I have a 8V1 RS3 with the following mods:
Decat downpipe
Forge Motorsport Intercooler
Forge Motorsport BOV / throttle elbow
Leyo Motorsport Intake
Leyo Motorsport Boost Pipes
Autotech HPFP
Stage 2 Progressive Watermeth kit...
there is a lot of DIY videos that shows you how to paint brake calipers. Prepping is important as well as choosing the correct high heat resistance paint. The hardest part is taping off everything that you don't want painted and jacking up vehicle and putting on Jacks.
But all in all, pretty...
The other possibility could be that when they installed the discs that they didn't clean the hubs properly (Meaning the brake discs doesn't sit 100% flush).
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Hmm doesn't sound like the discs...
Something else is wrong unless you really thrashed the discs with hard braking and no cooldown which warps the discs again.
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Isn't it more expensive to replace the cat?
I would just cut it out and switch off the Lambda sensor via mapping. Remember that you don't have to do any performance mapping (you want to keep car OEM).
Alternatively installing a mini cat cat fooler is also a choice
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Took the RS3 to an AWD DYNO to see how she performs:
Wheel power: 244kw & 558nm (329whp & 401 lb-ft)
Engine Power: 279kw & 620nm (380hp & 457 lb-ft)
Modifications:
Stage 1 ECU Remap
Stage 2 TCU Remap
Downpipe
Intake
Video of the dyno run:
Audi RS3 Dyno Run - Stage 1 Tuned with Downpipe -...
Rogue Performance catless downpipe fitted!
Basically all 3 catalytic converters has been deleted now and the 5pot sounds MENTAL!!
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Sounds like slipping / failling clutches. Don't disregard the mechatronics.
I would really recommend getting your vehicle to some DSG specialist and just checking it out before it gets worse.
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Hmmm i also have a prefl RS3...
What happens when you stop at an incline...and take your foot of the brake? Does it creep forward?
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Leyo Motorsport Intake fitted to the RS3
I'm not really concerned about any power increase (i believe there is) but I did this purely for the improved intake noises. It really brings a smile to my face.
I would have loved a carbon intake (Eventuri) but at this stage I cannot justify the price...
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