Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Moderate — 2–4 hours
Overview
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Vehicle Symptoms
- Check engine light illuminated
- Loss of power during acceleration
- Rattling noise from exhaust area
- Sulfur smell from exhaust
- Poor fuel economy at highway speeds
Diagnostic Codes
- P0420 – Cat Sys Efficiency Below Threshold (B1)
- P0430 – Cat Sys Efficiency Below Threshold (B2)
Relevant Conversations
- P0420 on my Audi S4 B9 3.0T – what to do?
- High flow cat vs stock performance gains
- Best exhaust mod for 2018 S5 – cat upgrade
- CTS Turbo high flow cat review and install
- Check engine light P0420 after cat replacement
- S4 B9 3.0T cat delete vs high flow cat
- Forum: P0420 and P0430 on Audi S5 B9
- Installing high flow cat on Audi S4 step by step
- Will high flow cat cause O2 sensor codes?
- Co-purchase: downpipe or tune with high flow cat
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
Fitment Guaranteed
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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
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Specifications
| Brand | CTS Turbo |
| Part Number | EXH-TP-0009 |
| Category | Exhaust |
Videos
CTS Turbo HF Downpipe Installed! SOUNDS GREAT ON MY AUDI B9 S5!
CTS Turbo Audi S4/S5 (B9) High Flow Cat DIY Install & Revs
CTS Turbo Inlet install on Audi B9 S5 Sportback.
B9 Audi S5 CTS High-Flow Cat Installed - Part 2 | Drive + Exhaust
Audi S4 B9 2018 CTS downpipe
CTS Turbo Charge Pipe Install - Audi B9 S4
CTS Turbo Audi B9 S4
CTS Turbo Downpipe Install on B9 Audi S5
B9 Audi S5 CTS Turbo Inlet Pipe Install With Revs!
How To Install CTS Front Mount Intercooler - Audi B9 S5 3.0t
B9 S4 - Integrated Engineering - Turbo Inlet Pipe Install
AUDI S4 B9 | CTS TURBO TESTPIPE SOUND
B9 S5 CTS Turbo Inlet Pipe MOD-2
Updated IE Turbo Inlet for Audi B9 S4/S5 - Install & Review
INSTALLING A CTS High-flow DOWNPIPE ON THE S5! (BEST SOUNDING V6)
About MOTORMIA
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.
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