Johncy2000

Wow can I feel the difference. I had it tuned for HFC and she is a lot faster now. I highly recommend doing this if you have short tube headers. I hope I have at least 500whp right now.

cls55

more info please.
thanks

shardul

iTrader: (1)

told you to do this back in january

AWOL

which cats? how much $$$

lets hear it

FASN8N

Love the stance, I bet you have major negative camber?

tbal

+1

Johncy2000

I will post a video tomorrow morning. Cold Start and Revs. THey are called Thunderbolt Race Cats from ebay. Muffler shop was able to utilize the up pipe from the old cats. I think it freed up about 15 to 20 hp. Because my tune was for HFC.

Johncy2000

The sound is like no other E55 ive heard except Shardul's of course. You can for sure hear the induction noise a lot better too. Car is breathing a lot better now. I waited quite a while to do this but i guess I wont be getting long tubes anymore. PLM Headers FTW!

3 Inch Piping

PLM Headers------>High Flow 300 cell Spun Cats------>Xpipe---->Eurocharged Mufflers

tbal

Sound clip ASAP or ban

guysandiego

Do you still have your 2nds?

mikeevo

any drone inside at any speed. they sound fairly quite did you pick up any increased noise inside the car. May be my next mod, did you have some wt saving with the HF cats compared to stock.

HeissRod

He hasn't posted the vid yet?

skratch77

I just took those suckers out lol

tbal

why you take them out scratch?

skratch77

Iv had them off ever since I did my headers.With kleemanns you have to cut them off,they dont bolt up to the stock cats.

Johncy2000

Here's the video guys!!

http://www.youtube.com/watch?v=Zy0OtPrFN2M

guysandiego

You probably already answered this on another post -- but whats your full exhaust situation? headers - resonator - 2nd cats - x-pipe - ???

AWOL

Thanks. Not sure on actual numbers, but surprisingly my tires have pretty even wear.

As for the op, how much did it cost to have them welded in?

tbal

I don't see then on eBay?

Johncy2000

I paid 100 for the install. He hooked it up.

Johncy2000

PLM headers, High flow cats, no secondary cats, xpipe, and Eurocharged Mufflers

AMG_RL

are you running a larger pulley? I think you'd be hard pressed to hit 500whp on the stock pulley. car sounds good nonetheless.

Johncy2000

180mm pulley, headers, HE, Pump, 3 inch exhaust, no primaries, HFC, no secondaries, EC Mufflers, K&N Filters

guysandiego

keep us updated on how those cats hold up --- I recall someone having the meat of the cats coming loose -- thus rattling and causing all sorts of annoying problems -- I just wonder if the cheaper cats can hold up to our cars power output.

I Like Soup

So I guess there is no difference between your setup and someone who had long tubes done? What is the benefit going the route you took? I am curious as I have the same mods as you with the exception of the exhaust. I have long tubes with 200 cell race cats and stock mufflers. Thanks!