Im looking for suggestions for performance upgrades in HP and Torque for my 05 SL 55 AMG. ECU tunes and Exhaust upgrades? thanks

Pulley, belt wrap, tune, and just go to a local muffler shop and have them cut out your secondary resonators and secondary cats. Check out fabtechperformance.

Leave the resonator unless you want it louder and more raw. You'll get zero performance removing it.

Before doing any of these mods make sure you fit the latest Bosch water pump and also fit an upgraded Heat Exchanger to avoid cooling problems.

by cutting out the resonators and secondary cats will that mess with my emissions test we have to do up here in WA state?

IMO do some research on Washington smog laws. You might not be able to mess with the exhaust much, but that does not mean you cannot do a smaller SC pulley or bigger SC counter pulley, plus some cooling mods and a tune. This will give you serious power gains.

Have a look at the E55 W211 thread to see what the guys there are doing. We share the 55K motor and they seem to be the mod nuts of the forum.

If WA smog will allow and you want to go for big HP and TQ gains, the best first mod IMO is long tube headers. From there, you can make tons of additional mods as you wish. Just make sure you have no issues with WA smog as LTs eliminate the primary cats.

In Wisconsin, where I live, all they do for smog is pull smog related codes. That is easy to defeat. I know some states, like CA are supposed to perform an exhaust inspection looking for mods. Done right, I can't imagine many inspectors could look at an AMG exhaust system and tell if it is stock or not. I doubt most even look.

We've done a number of these kinds of mods. If you delete the secondary cat, you will probably get a CEL. That situation can be avoided by passing it in the ECU. We make those changes when we do ECU/pulley exhaust mods.

Deleting secondary cat will not cause CEL. The O2 sensors are before the secondaries.

thanks. Here in Wa they pretty much just plug into the computer and go by that. I appreciate the info and suggestions. beings that I only have 25K on my SL55 not sure if I should wait awhile before doing anything too much. Are the ECU mods very difficult??

You won't throw a code and you will pass emissions testing.

Who are you guys using for tuning ? Who is the best I should ask ?

For my '05 SL 55 I've used various places to upgrades all sorts of things on my car...Kleemann for the headers, Eurocharged for the 82mm TB, one step colder spark plugs, phenolic spacers, upgraded pulleys, upgraded belts, Buckhead imports for transmission, tuning (ECU & TCU) .....exhaust 2nd cat & res deletes, SS brake lines, ceramic brake pads, eurocharged for the upgraded heat exchanger & pump, filters, buckhead imports again for the closed loop fuel lines, eurocharged 550 injectors, Shardul for the belt wrap kit, ...etc.. etc...it never ends....if funds are huge for you I recommend also upgrading to the 6.1 liter Brabus sized engine and get either the Weistec supercharger upgrade or have a custom shop drop twin-turbo's on it also....also for LSD I went with Quaife....hope this all helps...after this you will need to probably seriously upgrade not only the cooling but also the brakes in general and the LSD and put some very wide tires on the back...might have to widen the wheel arches to fit really big ones though....not cheap but will look very mean and bad ***.....

A fully/completely upgraded SL 55 with all the recommendations from mbworld forums is a force on the road.....watch after that when your car will then walk away from cars that you never ever thought you had a chance to pull on ever....it will shock you how fast they can get....especially after traction is not an issue...like on the highway when you're cruising already at 80 or 90 MPH and a much more expensive and new sports car rolls up on you and you straight up gun that s**t from like 80 to 180.....it will in a fully modded 55k only take a blink.....and you'll leave a lot in your dust....

SL65amg, do you have any videos? One of the sound would be great!