Well I wasn't planning on doing too much if anything. I love the M team design in most fronts. The Beast could use tad stiffer springs, at high speed onramp corners it has a bit of body roll. The spring/shock/wheel design affords a good ride with decent handling but not hard driving.
The stock sound (I have cut pipes before tips however, seller tells me those are stock-he had 2 M5s so likely his old ones from other car?) is good for me in general...howls at WOT but quiet around town...good low bass grumble on start up.
Perhaps a CAI with tune would give it a bit more "bite" outta the gate.
I am no stranger to mods. I come from the muscle car era (old phart) and have done many things to many cars.
In fact...this M5 reminds me of old late 60's big block torque at low revs. 69 Camaro with 427-ish grunt keeps comming to mind when I push "SPORT".
For discussion purposes here is my most recent project I did.
2005 Mustang GT (ordered from Ford in 2004). I had sold this 3 years ago and am in love with BMW now albeit the new 400+ HP GTs are pretty sweet. Completely different comparison though...more M3 world.
-CAI with Predator tune
-Kooks long tube headers with Cats and X-pipe
-Borla cat back exhaust with 3" rolled tips
-Steeda short throw shifter
-Tokico adj shocks with H&R (I think) springs on 4 corners, lowered agressive carver
-Steeda panhard bar and camber plates
-Staggered 18" TSW wheels with Nitto rubber
-Steeda Cowel Hood with other body mods
-Carbon Fiber interior upgrade
-Full window Tint
Dyno-ed appx 330 or RWHP.
The 4.10 gears and CAI/tune was an insanely fun upgrade and the suspension mod put it through corners like on rails....literally.
The M5...I couldn't imagine changing gears as with that torque I shift pretty low rpm pretty fast. I still smile thinking this Beast scoots with 3.15 gearing.
Am I correct to assume these stock M5s dyno out (RWHP) appx 350-360HP? Anyone have a torque/HP curve pull?
Good CAI/tune choice?
Any slightly more aggressive mufflers with NO drone.
My old Kooks/Borla/X pipe sound was a gurgling WOT insane sound...turned heads for blocks. Loved it but, not in my 4 door M5 I think.
Oh and about me...I'm an aerospace engineer and up until 3 yrs ago, worked long time for a German company and I have been on the autobahns in BMW/Mercs at insane speeds. These Germans can really design/build great high speed cars.
Nice and congrats on the car! Reminds me of the time when I first got my M5. If the car is working well, I recommend the Evolve tune with IATs relocation, Bilstein PSS to sitffen the ride just a tad bit, and a muffler delete. The muffler delete ("straight pipes") will give it a muscle car sound - very tame below 4k, but lets the V8 sing above 4k! Just read the muffler deleter thread for yourself. There is some drone right around 2k RPM in 2nd gear, but IMO, it's a no factor. If you're experiencing some squat upon acceleration, body roll on mild curves, and diving on hard decelaration, the Bilstein PSS will eliminate all of that!
Last time I dyno'd my car it was putting down 330 hp and about 325 tq. I have since changed pre-cat o2 sensors and the CPS sensors so it may be putting down the same numbers, maybe slightly higher, but the butt dyno says it is still pulling strong!
__________________ Maint: Liqui Moly 10W60 Race Tech GT1 Engine Oil, Pentosin MTF2, Mobil1 Full Synthetic ATF Steering Fluid, ATE Super Gold Brake Fluid Wheels: Style 65 18x9.5" Squared 275/35/18 Dunlop Direzza Z1 Sport Star Spec, 3mm Front Spacers, Turner Motorsports Extended Bolts Braking: Genuine BMW Rotors, Pagid Yellow RS 19 Endurance Racing Compound, Titanium Backing Plates, Open Brake Ducts, FTE Lines Handling: Intrax Racing Springs, Bilstein B8 Monotube Dampers, Ground Control Camber Plates, Dinan Strut Tower Brace, Dinan Rear Sway Bar, X5 Thrust Arm Bushing Power: Is Nothing Without Control, Stock Motor Dyno'd @ 341WHP, 319LB-FT Dynojet. Aero: None Yet Race: email@example.com Englishtown, Lime Rock Park 1'09.9", New Jersey Motorsport Park Lightning Circuit 1'23.420", Thunderbolt Circuit 1'44.2", Watkins Glen International *tbd, Monticello Motor Club *tbd. Gear: Bell SA2010 Sport Helmet, Sparco Tornado Racing Gloves, Sparco Speed+ Racing Shoes, OMP Balaclava Winter: Style 66 17x8, 17x9 Staggered 235/45/17-245/45/17 Bridgestone Blizzak WS70 Studless Snows Interior: E60 SSK, ZHP Shift Knob, MK4 Navigation, Umnitza VXX Angle Eyes, Brushed Aluminum Trim Swap Favorite Quote: "Understeer is when you hit the wall with your front end. Oversteer is when you hit the wall with your back end. Horsepower is how hard you hit the wall. Torque is how far you move the wall when you hit it. "