Damn, that seems do be a shit load of mods, have you considered upgrading to a cl55 or a cl600? probably would be much cheaper than your project IMO.

 

Looked into this already but can still do these mods at less than the cost of buying a 55 or 600

 

i did secondary cats delete...hell of a job !!!! ..now planing to do the primary...i hope there not metallic

 

Did you really notice the difference?

 

K&N Air Filters - no noticable performance on big engines
ECU Upgrade - agree
Sports Headers - agree
200 cell sports catalysts - agree
Sprint Booster - not recomended
Crankshaft Pulley - not recomended
Performance Camshafts - not recomended on engines more than 2yrs old
ignition cables - little if any performance
iridium spark plugs - not a performance item, more lifesaver for spark plugs
Lowered Suspension (by 30mm all round) - will not make your car drive faster

Overall, useful perform. upgrades are ECU and Headers. Rest, will deliver little or no performance.

 

Thanks for this. You've confirmed a few of my thoughts. Always felt S/Booster might make it difficult to drive smoothly at lower speeds and leads and plugs not really worth the money and if I started messing too much with the internal engine parts, I might wreck what's essentially a solid & reliable motor! The suspension is just about looks as the ABC lowers itself 30mm at over 100km/h anyway.

 

The only way you are going to see a 100+ HP difference is to increase the compression ratio and extensive head work along with all the other modifications. A supercharger will net you a little more than 100 HP without a doubt and more depending on the boost you run. You will not be happy with the power this work is going to net you and the cost it's going to take to modify a NA engine.

If you want a faster ride, sell the car and upgrade to a 55 or 600. Get a 600 and add an ECU tune. You will have 600+ hp and you will have much better resale value. A modified 500 will probably be worth LESS when you try to sell. Not to mention, you will likely need a custom ECU tune for the 500 when it is all said and done. That will not be cheap. Just can't believe it is cheaper to do all those mods on a 500 than buy a 55 or 600.

 

i still did not remove the primary...so no cell issue...but you can trie 02 foullers

 

I'm new here bought my 2005 CL500 bout a month and half ago bout 112,350 mi on it. Where is the best place to purchase LED bulbs and lights. I'm still learning about the performance, planning on replacing the motor mounts within the week. Any suggestions greatly appreciated.

 

Cheapest and best mod

By far the cheapest performance change is to add a bottle of Lucas octane booster....even on a 500 rather than a 55. For 8 bucks it adds, according to my 'Torque + dongle' combo, 3-4 degrees of timing which you can definitely feel. Bad news is that it only lasts one tank full.
I have tries other octane additives but none work as well as the Lucas.

 

i gotta know, nhow was the header upgrade? I have an 02 CL500 and want to upgrade the headers to long tubes and get a new exhaust. What brand did you go with and how has it helped your car?

 

Don't expect an answer - this thread has not been touched in 6 years old and the OP has not been seen in over 12 years.