SKU: 52784091501

Competition Series Catless Secondary Downpipes 2025+ M5 S68 Engine

Sale price$357.75 Regular price$397.50
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Ships within 48 hours · Estimated delivery Aug 21 - Aug 26

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Description

Competition Series Catless Secondary Downpipes 2025+ M5 S68 EngineIntroducing our Competition Series Secondary Downpipes for your twin turbo S68 engine! Fits 2025+ M5 (G90) Key Features: Made in the USA! Manufactured in house. Now available for the 2025+ BMW G90 M5 S68 Engines! Does not set off the Check Engine Light (CEL). Higher Max Horsepower Power Curve Higher Initial Torque Curve. Torque curve hits faster and higher and longer. Better throttle response and faster turbo spool up times. Mandrel Bent 3" piping.

Introducing our Competition Series Secondary Downpipes for your twin turbo S68 engine!  Fits 2025+ M5 (G90)

Key Features:

  • Made in the USA!  Manufactured in house.
  • Now available for the 2025+ BMW G90 M5 S68 Engines!
  • Does not set off the Check Engine Light (CEL).
  • Higher Max Horsepower Power Curve
  • Higher Initial Torque Curve.  Torque curve hits faster and higher and longer.
  • Better throttle response and faster turbo spool up times.
  • Mandrel Bent 3" piping.  Smooth transition to the exhaust system.
  • 100% Stainless Steel Construction
  • 100% TIG welded for better quality welds
  • Precision CNC machined turbocharger V-Band flange.
  • Mirror polish or brush finish
  • Available with high temperature black thermal coating to reduce underhood temperatures.
  • Retains factory slip on style connection.
  • Compatible with the factory or aftermarket secondary downpipes.
  • Track tested durability.
  • Includes all hardware for complete installation.
  • Limited Lifetime Warranty.

Restrictions in the exhaust system robs horsepower and torque especially on turbocharged cars.  Thus, removing as much exhaust flow restrictions will increase horsepower and torque significantly.  The factory catalytic converter found in the factory downpipe is a big culprit of this and is a major exhaust flow restriction.  The factory catalytic converter is made up of catalyst material formed into "honeycomb" weaves.  Exhaust gas must pass through these tiny "honeycomb" weaves on their way to the exhaust system thus causing a major exhaust flow restriction.  It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down (which increases restriction).  By replacing the factory downpipe/catalytic converter with our Competition Series Downpipe, more power is unleashed!  You will feel the difference instantly. 

Our Competition Series Downpipes is constructed out of 100% 304 grade stainless steel and utilize mandrel bent piping. They are 100% TIG welded by our in-house fabricators and built in the USA.  Factory Style flanges are CNC machined cut out of billet 304 stainless steel.  Stainless Steel CNC machined O2 sensor and laser cut brackets are TIG welded using stainless steel rods.  The O2 sensor is positioned at the factory location.  100% bolt on. 

Our downpipes are designed to fit perfectly with either the factory exhaust system or your aftermarket exhaust system.  There are no compatibility issues whatsoever.  The downpipes will come by default with brushed finish.

The BMW M5 (G90) has 2 primary catalytic converters and 2 secondary catalytic converters for a total of 4 catalytic converters.  Our Competition Series Secondary Downpipes replace just the secondary section You can retain the factory primary catalytic converter or aftermarket primary section.  Will match up to factory or aftermarket exhaust systems.  The secondary downpipes are after the secondary o2 sensor that monitors the catalytic converter so changing it will not set off a check engine light (CEL).

Ceramic Thermal Coating - The purpose of ceramic coating downpipes is to keep heat from the exhaust gases inside the downpipe from radiating out. This keeps underhood temperatures lower and less heat absorption by nearby parts/surfaces.  Another added benefit is that by keeping in heat (energy) in the exhaust gases inside the downpipe, exhaust flow velocities stay up, resulting in lower backpressure. The ceramic coating also adds additional corrosion resistance. We utilize the best ceramic coating possible. Our thermal coating can resist up to 2000F of heat. It is available in black only (all the other colors cannot withstand the high levels of heat).

CAUTIONThis product is intended for OFF ROAD COMPETITION USE ONLY. Not legal for use on pollution controlled vehicles upon public road/highways. THIS PRODUCT IS FOR SALE FOR ALL 49 STATES EXCLUDING CALIFORNIA.  In addition to vehicle use verification, a Vehicle Compliance Waiver needs to be signed.

THIS ITEM IS NOT FOR SALE, INSTALLATION, OR USE ON LICENSED VEHILES IN THE STATE OF CALIFORNIA. 

The item is for sale for international customers without restriction.

Please contact us at [email protected] or call us at (626) 334-6609

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • 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: 52784091501

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4.7 ★★★★★
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Marie Grey
Dallas, US
★★★★★ 5
Fantastically Awesome!
Special Size: Wide Leg Crop, Size: 12, Color: Black
They are spectacular! Very nice quality and I love how they fit. Got the black and ice blue. Having read the reviews, I did go ahead and sized up 2 sizes and it worked perfectly. That is the only con in these jeans, they run at least 2 sizes too small. But, being 100% cotton, I expect that they will shrink down to pretty close my normal size. (I like jeans loose, so it's all good.) Got the cropped ones and I just love them. They are normal length now (because I am short), but after drying, I think they will end up at top of my ankle, and that is cool. The fabric is on the heavy side, but I expected them to be much heavier than what I got. I have a pair of Lee wide leg jeans, and they are much heavier than these. I hope that helps someone in terms of comparison. But overall, these jeans are fantastically awesome - and on sale too boot!! Buy them. They are very wonderful. ❤️
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Reviewed in the United States on June 11, 2026
E
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Eliza
Dallas, US
★★★★★ 5
Insanely great jeans for the price!
Special Size: Wide Leg Crop, Size: 12, Color: Medium Blue Vintage
I’m obsessed with these jeans. They’re comfortable and I think they legitimately look great. I had a baby 6 months ago and my body is “in transition” so I didn’t want to buy anything too expensive. These are cute, fit well, good quality. Excellent for short girls - I’m 5’ tall and they’re exactly the right length for a full-length jean. I feel like they’re fashionable without being too trendy (they work for 30somethings as well as 20somethings). They’re nice thick cotton with very little stretch. Because of that I’d be conservative with sizing because they do stretch significantly when you wear them. I got these in the lighter blue, too. The darker wash is slightly smaller and I wound up liking the color better, too. But the light wash is nice.
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Reviewed in the United States on November 16, 2025
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Lynn
Massapequa, US
★★★★★ 4
Excellant value
Special Size: Wide Leg Crop, Size: 14, Color: Rinse, Special Size: Wide Leg Crop, Size: 14, Color: Rinse
Purchased the “cropped” length. I am 5ft 3.5 inch. Weight 170lbs (42 inch hip/38 inch waist) normally wear a size 10/12 or 31 in jeans, depending on the brand. I ordered up at 14 for these based on other reviewers. (When held up to other jeans they were the same as a Talbots 10 at the waist) Prewash they felt good, a little big& length hit at the top of my foot. After wash and dry, the fit was almost perfect and the length was at lower ankle. Ordering up is probably the right choice, although I think I could have been comfortable in a 12 (with no drying). They are a tad bit too long for a “cropped” look IMO. The wide leg is a true wide leg and falls straight from the waist. The material is heavy and there is almost no give/stretch - so a traditional denim. This is the dark blue and it is a true dark blue. You can’t beat the price, excellent value.
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Reviewed in the United States on March 31, 2026
M
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MCC
Waukegan, US
★★★★★ 3
Be careful when washing!!!
Special Size: Wide Leg Crop, Size: 12, Color: Iced Blue Light Wash
Loved the jeans but after I washed them only after wearing one time, the color got completely stained. I washed on gentle with like colors and somehow the entire jeans turned splotchy. So upsetting because the fit and feel were great.
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Reviewed in the United States on January 3, 2026
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Verified Purchase
Annaliese Ramirez
Pawtucket, US
★★★★★ 5
Great Jeans!!
Special Size: Wide Leg, Size: 8, Color: Stone Dark Wash
I love these wide leg jeans! The denim is thicker and more durable than I was expecting, especially for the price. These are a great quality! I get compliments on them every time I wear them and people are surprised when I tell them they're Amazon Basic brand. They fit true to size as I followed the size guide. From now on my jeans will be this brand!
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Reviewed in the United States on June 6, 2026

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