SKU: 37404576145

Milltek Sport BMW B58 (G-Series)/ Toyota Supra (A90) High Flow Downpipe

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Description

Milltek Sport BMW B58 (G-Series)/ Toyota Supra (A90) High Flow DownpipeMilltek Sport BMW B58 (G Series) Toyota Supra (A90) High Flow Downpipe The Milltek Sport high flow downpipe is a direct upgrade for the BMW B58 (G Series) and Toyota Supra (A90), designed to free up the restrictive factory downpipe and let the turbocharged straight six breathe properly. With a larger 90mm bore and smoother internal flow, exhaust gases exit the turbo more efficiently, supporting stronger power delivery, sharper throttle response and a

Milltek Sport BMW B58 (G-Series) / Toyota Supra (A90) High Flow Downpipe

The Milltek Sport high flow downpipe is a direct upgrade for the BMW B58 (G-Series) and Toyota Supra (A90), designed to free up the restrictive factory downpipe and let the turbocharged straight-six breathe properly. With a larger 90mm bore and smoother internal flow, exhaust gases exit the turbo more efficiently, supporting stronger power delivery, sharper throttle response and a deeper, more characterful exhaust note.

The downpipe is available in two configurations to suit different builds and driving environments. Choose the version that best matches your needs and local regulations.

Off Road/Motorsport Use Only

This product does not have EC type-approval and alters a factory emissions control device. It may not pass emissions laws and tests in your country. 

Available Options

  • 200 CPSI Race Cat (SSXTY168) – Uses a high-flow 200 cell sports catalytic converter to reduce back pressure compared with the OEM cat, while still providing some emissions control. A balanced choice for road-driven cars wanting more performance without going fully de-catted.
  • Decat (SSXTY119) – Removes the catalytic converter entirely for maximum flow and the most aggressive sound. Intended for off-road or track use only.

Why Fit a Larger Bore Downpipe?

The downpipe is the first section of exhaust after the turbo, and the OEM part is one of the most restrictive components in the system. Replacing it with a larger diameter, mandrel-bent pipe reduces back pressure (the resistance the engine works against to push gases out). On the B58 platform, this is particularly effective because the engine responds well to improved exhaust flow, especially when paired with an ECU remap.

Expected benefits include:

  • Improved turbo spool and throttle response
  • Greater potential power gains, particularly when tuned
  • A deeper, fuller exhaust tone with more turbo presence
  • Better compatibility with stage tuning and full Milltek cat-back systems

Build Quality

Manufactured in the UK from high grade stainless steel, the downpipe uses TIG welded construction and mandrel bends to maintain a consistent internal diameter throughout. It is engineered as a direct bolt-on replacement, retaining factory mounting points and sensor bungs for a clean fit.

Technical Specification

Pipe Diameter 90mm
Fitting Time Approximately 2 to 3 hours (including removal of OE system)
Race Product Yes
E-Marked No

Important: This is classified as a race product and is not E-marked. The decat version is intended strictly for off-road or track use and is not legal for road use in many regions. Always check local regulations before fitting. A supporting ECU remap is strongly recommended to get the most from this downpipe and to manage any cat-related fault codes.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 37404576145

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4.1 ★★★★★
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guitar man
Pawtucket, US
★★★★★ 4
Good read overall, the book provides a little more info from whats out there.
Format: Hardcover
Did not address the suspecious death of Pat Price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 17, 2024
S
Verified Purchase
Sean Regan
Waukegan, US
★★★★★ 5
Good book
Format: Hardcover, Format: Hardcover
I finished it in 2 days, hard to put down.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 14, 2024
F
family guy
Port Orchard, US
★★★★★ 5
Anything from Skip I will read ASAP.
Format: Hardcover
I so look forward to reading this. Skip Atwater is a pioneer in the exploration of consciousness. I had the pleasure of meeting him for an interview while making my film Third Eye Spies and his knowledge of remote viewing and the Army history of the subject was some of the most compelling testimony I heard. I am excited to get my copy of this new book.
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Reviewed in the United States on July 30, 2024
M
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marek
West Palm Beach, US
★★★★★ 5
gut
Format: Hardcover
gut
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Reviewed in the United States on March 2, 2026
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Verified Purchase
bowonwing
Carnegie, US
★★★★★ 5
Glorious book on Man's (unfortunate) wars with himself
Format: Hardcover
If you have any interest in the subject matter, buy this book, it is fantastic. Many beautiful paintings and maps, some on full pages. One comment. In various parts of this book it has something called "Directory," which is just paragraphs on events that the writer did not see deserving a full page in the book. On page 42 we have "Directory: Before 1000 CE," and included is a paragraph on "Teutoburg Forest, Roman-Germanic Wars, 9 CE" The paragraph ends with: "Although there were subsequent expeditions to Germany, the Roman frontier became fixed at the Rhine (River)." Surely, this is one of the greatest battles and results in European history and should have had a full two pages in this book instead of just a short paragraph. See the Battle of the Teutoburg Forest, 9 CE. Another short fall of this book is no mention of Boudica, who in AD 60 0r 61, was defeated by the Romans (commander- Suetonius Paullinus), who went on to "rule" England and Wales to about AD 410. This is my review of Graham Webster's book "Boudica: The British revolt against Rome in AD 60: Lucid, well written on Boudica, queen of the East Anglian kingdom of the Iceni tribe, and much more. Sixteen pages of black and white photographs. Contents (all of these Chapter headings have sub-headings)1. Sources 2. The Opposing Forces and the State of Britain 54 B.C. 3. Britain between the Invasions 54 B.C.-A.D. 43 4. The Conquest of A.D. 43 5. The Storm Breaks A.D. 60 6. The Evidence from the Ground 7. The Trail of Destruction Epilogue References Bibliography Glossary of Latin Terms and Words Index 24 Plates 8 Maps and Diagrams The Epilogue, a timeless piece of writing, should be read by everyone, young and old. The last sentence of the book in the Epilogue reads: "They may help us to see more clearly what is happening in the world today, and even help us prevent some of the worst excesses of human folly and greed for power, which brings incalculable misery and suffering to the innocent majority." Re: Boudica and the final battle with Suetonius Paullinus and the approximately 12,000 men under his command and Boudica's warriors, which could have been as great as 100,000, page 99, (but could be less); we apply "O2S4 MEC:" Objective (Simplicity); Offensive, Sprit of; Superiority at Point of Contact (Economy of Force); Surprise (Security); Security (Surprise); Simplicity (Objective); Movement (Mobility); Economy of Force (Superiority at Point of Contact); Cooperation (Unity of Command) On pages 98-99 in the book we have Fig. 5-, (if this is indeed the place of the final battle took place) "The battle between Boudica and Paullinus in its possible Mancetter context," it is clear that Paullinus had chosen the place of the battle and his position to force Boudica's warriors to a frontal attack and thereby creating "Superiority at Point of Contact." And this is probably what happened, as Boudica's warriors attacked and were funneled into the Roman Legion "buzz saw" due to their "simple" frontal attack. From Fig. 5 again, it is clear that there was forest behind Paullinus and his men and the River Anker in front of them. I do not know if it would have possible to attack Paullinus from the rear by going through the forest. However, again from Fig. 5, it is apparent that Boudica's warriors probably could have attacked Paullinus from the right and left flanks (even though the Roman cavalry was on both flanks), creating a three pronged attack, negating some of the Roman's "Superiority at Point of Contact." It is clear that Boudica lost "Cooperation (Unity of Command)," or never had it in the first place, leading to the rout by Paullinus' much smaller force over a much larger force and the fate of Britain for about the next 400 years. The Roman brutality that caused this uprising and Boudica's, and her warriors response, are part of history. Paullius' (whatever you think of him), choice of the battlefield was tactically brilliant, and no one, including Boudica, could match it on the field of battle that day.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2019

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