4" Downpipe — GTI / GLI (Mk7/Mk7.5) | Big-Bore 400-Cell GESI GEN2
Brockett Built
Every part is built after your order is placed. For a better reference on current lead times, call the shop at (309) 256-6993.
- Made in the USA
- Lifetime warranty
Description
The 4" Downpipe is our maximum-flow, big-bore downpipe for the Mk7/Mk7.5 GTI and Jetta GLI — built for higher-output and hybrid-turbo setups that want the most out of the exhaust. Fully TIG-welded, back-purged 304 stainless with a high-flow 400-cell GESI GEN2 catalyst in a 4.5" housing.
Originally a Baun Performance design (GTI Jake) — this is the same big-bore downpipe formerly built by Baun Performance, now hand-built by Brockett Built.
Pairing with a cat-back? Add a midpipe.
Do you have a specific cat-back you're pairing with? Our resonated midpipe is built to fit both this downpipe and your cat-back — select the 3.5″ diameter to match this 4″ downpipe, choose your cat-back, and we size it to bolt right in. Add the matching resonated midpipe →
Fitment
- VW Mk7 & Mk7.5 GTI — 2015–2021 (front-wheel drive)
- VW Jetta GLI (A7) — 2019–2025 (front-wheel drive)
- Engine: EA888 Gen 3 2.0T · best suited to stage 2+ / hybrid-turbo builds
- AWD cars (Golf R / Audi S3 / A3 / Alltrack) use our dedicated AWD 4" downpipe — see that listing.
Specifications
- Diameter: 4" upper section into a 4.5" catalyst housing
- Catalytic converter: 400-cell GESI GEN2 high-flow
- Material: 304 stainless steel
- Construction: TIG-welded, Argon back-purged, hand-built to order
- Flow: Independently bench-tested at approximately 396 CFM (downpipe alone) — roughly 143% more airflow than the stock downpipe
Built to order. Emissions compliance varies by region — contact us to confirm the right configuration for your build. Allow for fabrication lead time.
Part of the GTI Jake / Baun Performance lineup, now designed and built by Brockett Built.