The F90 M5's twin-turbo V8 has a great voice. BMW just put a resonator in the middle of the exhaust to make sure you only hear part of it. Start the car in the garage and it sounds strong. Get on it in the tunnel and you want more.
The Dinan Resonator Delete Kit for the BMW F90 M5 and M5 Competition removes the factory resonator between the catalytic converters and the rear muffler. In its place goes larger-diameter T304 stainless steel tubing and a mandrel-bent X-pipe, replacing the factory hydro-formed resonated section. Dinan describes the result as a more aggressive tone, more volume, and a smoother, fuller note.
What the Dinan Resonator Delete Does to Your M5
With the resonator gone, more of the S63's sound reaches the rear muffler and the tips. The mandrel-bent X-pipe holds its diameter through the bends for minimum restriction, unlike stamped X-pipes, and balances flow between the two banks of the V8. That is what smooths out the tone instead of just making it louder. Dinan does not publish a horsepower figure for this kit. This is a sound upgrade, and we sell it as one.
Install and Legal Status
It is a bolt-on kit at 25 lbs, with mounting hardware included and about 2 hours of labor. It works with the factory rear exhaust, and it is a natural match for the Dinan F90 M5 Free Flow Axle-Back. Before you order, check your local rules. Dinan has not issued a CARB Executive Order for this kit and notes that some exhaust parts are not legal for use in California or states with similar regulations. Dinan part number D660-0081. Sold by AutoTecknic, an authorized Dinan dealer.
What's Included
- Dinan T304 stainless steel resonator delete section with mandrel-bent X-pipe
- Mounting hardware
Key Features
- Removes the factory resonator between the catalytic converters and rear muffler
- Mandrel-bent X-pipe for minimum restriction, unlike stamped X-pipes
- Balances flow between both banks for a smoother, fuller V8 note
- More volume and a more aggressive tone
- 100% 304 stainless steel with brushed finish
- 25 lbs, bolt-on install in about 2 hours
Vehicle Fitment
Fits the S63-powered BMW M5:
- BMW M5 / F90 Sedan (2018-2023): M5, M5 Competition
Installation Notes
Plan on about 2 hours on a lift. Let the exhaust cool completely, support the rear section while the middle is out, and follow the Dinan instructions included with the kit.
- Raise the car on a lift and let the exhaust cool fully.
- Support the rear exhaust, loosen the clamps on either side of the factory resonator section, and unhook its hangers.
- Remove the factory resonated section.
- Fit the Dinan resonator delete and X-pipe, and loosely install the supplied hardware.
- Align the system, tighten all clamps and hardware, then start the car and check every joint for leaks.
