e55amg999

after a year of ownership my e55 is now mechanically sound. I'm trying to figure out what is available to add hp/tq?

Im ordering a set of kleemann headers, and have removed everything from the exhaust besides the rear muffler and front most cats.

so my question is what else can I do besides adding a supercharger to extract more power?

CharlyE500

One of the member is doing Air box and cost around $500 compare to Renntech $1200 + And should add 15 to 20hp.

With Air box, header and tune should be close to 400hp.

NAFT1

If you have a 1999, as your username suggests, you'll find that we don't have a lot of options on tuning due to our ECU's non-programmable ROM as compared to the facelift 2000-2002 models in which the ECU can be flashed with a new tune.

snooozie

Like CharlyE500 say do the airbox. You can mod the box your self. Cut out the fins and sand down the box. Make sure you smooth out the inside shine it. This will give you a nice smooth surface and that will give a good amount of fresh air coming into the engine. Also, I would recommend getting the Afe Pro Dry S air filters.

eFifty5AMG

Speed43 custom makes the airboxes, but he does way more than just sand down the fins. He only has a couple left so, if you're serious, get one while you still can. I am a huge fan of my custom airbox! +1 on the AFE filters, been running them for quite some time & love them; no messy oil or potential MAF issues.

Speedriven1

Once the of standalone ECUs catches up to demand (long story) that will be an option that will allow you to go turbo, if that's on your mind. That said, you're pretty much there- maybe a hot cam, or going to 6.0L, but that's all big money.