Cts Turbo B9.5 Audi A4/A5/Q5 40TFSI/45TFSI High Flow Cat (2021-2025)
Ships free in the US
Make sure this fits your car
Fits: S4 / S5 / RS5 B9
- Shop tested in Dallas
- Free pickup in Dallas
- Installs at our shop
Free up your 2021-2025 B9.5 Audi A4/A5/Q5 40TFSI/45TFSI 2.0T’s potential with the CTS Turbo High-Flow cat.
This high flow cat downpipe is specific to the B9.5 facelift platform which uses a V-band style connection at the turbocharger, making it a perfect fit for the 40 TFSI or 45 TFSI Hybrid models.
3.5″ diameter stainless steel piping with a high-flow catalytic converter is matched perfectly to a billet v-band flange, allowing for optimal flow as exhaust gases transition from the turbocharger to the rest of the exhaust system. Substantial power gains, improved exhaust flow and a more sporty sound are the main benefits from installing the CTS downpipe.
Our friends at Boost Dynamic Tuning created the best Stage 2 file for this Simos 19.7 EA888.4 platform. CTS Turbo + BDT stage 2 combo is the best bang-for-the-buck performance upgrade for B9.5 40TFSI/45TFSI owners. Now available with end-user at-home tuning. Please see the link below for the compatible software tuning options:
Boost Dynamic Tuning Stage 2 for Audi A4/A5 45TFSI
Boost Dynamic Tuning Stage 2 for Audi Q5 45TFSI
Product features
- Designed using the latest 3D prototyping technology for perfect fit into factory location
- High-flow catalytic converter
- Large 3.5″ stainless steel piping, billet stainless steel flanges
- Flanges are fully welded inside and out
- Welded stainless steel mounting bolts for easy installation (saves you a lot of time)
- New gasket and copper lock nuts are included, if you wish to renew the turbo gasket: 5Q0253115C
- Not recommended for crackle/aggressive overrun tunes
- Compatible with factory or aftermarket cat-back exhaust systems
To remove the CEL that will occur, proper tuning software must be used. CTS Turbo recommends Boost Dynamic Tuning.
Fitment (for Borg Warner turbocharger 06N145702D):
- 2021-2025 Audi A4 2.0T 40TFSI/45TFSI (B9.5)
- 2021-2025 Audi A5 2.0T 40TFSI/45TFSI (B9.5)
- 2021-2025 Audi Q5 2.0T 40TFSI/45TFSI (B9.5)
Listed for these cars. Check the title and description for exact years, body styles and drivetrain.
| Make | Model | Chassis | Years | Fits |
|---|---|---|---|---|
| Audi | S4 / S5 / RS5 | B9 | 2018+ |
Not sure? Call or text 945-954-1142 with your car or VIN.
- Free US shipping on orders over $250.
- Free pickup at our Dallas shop, usually ready within 24 hours.
- Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
- Want it installed? Book the install at thegbmotors.com.
Full details are on our shipping and returns page.
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