who does the best tuning package for the sl55 for the maximum performance, kleemann or renntech?

Your question is loaded with about 4600 lbs. of explosives, but, regardless, the fact is I am prejudiced to Renntech............installation support/quality control/warranty.......I like 'em. Kleeman would have been my 2nd choice..........their stuff works well, from what I have read/heard.....

Renntech stuff on a -55 gets you close to 600 HP, if memory serves.

Kleeman, I do not know....BUT others on this site do.

Dave

P.S. Best of Luck in your Choice.

Both are incredibly wickedly fast.
At that point, you start gotta dropping HEAVY money to redo stuff because you just can't grip.

I would go with RENNtech mainly because they do not cut the exhaust pipe and remove the primary cats. Such a modification to the emission system makes the car illegal to drive on the streets. Disclaimer - or so I have heard.

Kleemann Stage 2 is a nice kit, add some Greenfilters whilst you are at it.

I did K2. Lotta bang for the $$. ECU reflash takes care of error codes so that car inspection goes through. Traction will be a problem though, the sound will not.

Definately Renntech! PM sent.

The word "best" is very subjective. Best in terms of power gains? Best in terms of reliability?

For instance;
Evosport has the shorty headers that produces the most gain compare to the other tuners while retaining the primary cats. If you do a search on the E55 board, many owners chose the Evosport headers and the Evosport cooling mod for the M113 Kompressor engine.

Regardless, the choice is ultimately yours, but the world of tuning isn't just Renntech and Kleemann.

yep look into EVOTECH! i also agree in what do you consider best? to me best is customer service then performance then price. but you might not see it that way.

oops i wasnt talkin to you adam i was quoting you cuzz i agreed with you but i was talkin to BIGRED

Haha...no problem Michael!

For some reason, it seems that kleemann is more popular with 55 cars, while renntech is more popular with 600/65 cars. Almost all the fastest E55's have kleemann stuff installed, so I would definitly go with kleemann for SL55. A side benefit (that does not affect my decision) is that kleemann is cheaper too.

the fastest E55 have klemann stuff? where do you get that from? the fastest E55s have a mix of parts. some do have kleemann some have renntech but look in the near future the fastest will be EVOtech and VRP. K and R are a thing of the past.

evosport has some nice gear... excellent performance...renntech/kleeman you
can not go wrong...

Well from looking at dragtimes, the cars with kleemann parts appear to be faster than cars with renntech parts

lookin at drag times. what about people that dont post thier times? also like i said the fastest cars even on drag times have a mix of parts. the fastest car to have just one tuners parts is sleeper X and he runs renntech! not sayin renn is better just sayin the mix of tuners right now is the way to go.

Renntech doesn't do its own tuning; Evotech does it for them.

It's safely to say that those Renntech 65 on dragtimes are actually Evotech's 65s.

I put Kleemann on my SL55...love it. Headers, cats..

What I also installed was the Quaife differential.

When I took the car to the installed, they guy told me the quaife was a complete waste of money. He highly recommented the rest.

After I receievd my car back, I got an apology. He said the thing he was MOST impressed with was the differential.

Car runs great, but I'm not sure how I would hold traction without it. I highly recommend adding that in.

About 2k FYI

Joseph

Thanks everyone for the different ideas & info, i will let u know what brand i went with when its done. Has anyone ever put NOS on an 55 or 65, would u blow the engine or is that just

A number of guys have run NO2 on E55's, including the one that I think holds the dragstrip record for an E (a high 10).

We tune lots of 55's and Mercedes vehicles in general. I see Evosport's power packages gaining excellent power.