alenpepic

Ive been running a Catless longtube setup for a year now, i do not care about the smog and emissions talk I'm concerned about my health lmfaoo. My engine is old i think the valve stems are getting old but anyhow its a old 500+whp smoke machine. Can anyone give me some advice about the 200 cell Thunderbolts, I'm afraid my car makes too much power it will just blow through the cats. does anyone think they can last me at least a year because i plan to v band them and swap if they go bad.

bayhas

Someone online claimed Kooks green are capable of meeting the health, smell, EPA, OBD, and performance needs, even in SL55

I am yet to verify, but I am very much considering mid length headers and pair of these Kooks,

These are the vids I saw, but I have not seen the end product yet

6172crew

E55amg0220

Ive got 400 cell high flow obd 2 cats on my 530 rwhp 03 e55 with the vbands and mbh long tubes. They are suppose to be 5 year warranty cats and they did not hinder power at all. The smell went down and so far they seem to be doing fine, its been a couple monthes an its driven daily an hard often. As for longevity well time will tell but so far doing pretty good.

6172crew

bayhas

I second, and do you have a picture of the installation? I would like to get some good headers, but I live in MA, and must keep the car legal.

E55amg0220

their ones i found on amazon when i googled 3in inlet and outlet high flow cats and for the price i figured if they blow out no real loss and so far very impressed but if they fail I will be trying the kooks cause their suppose to be great but alot more money. Heres a link to them they were very nice quality and like i said so far they are doing great, they did not effect my rwhp at all not even 1 rwhp, sound was great, smell totally gone, and they do have a 5 year warranty but who knows if they will honor it but for 48 bucks ea worth a shot.

This is what the current setup looks like and theres a few new changes Im doing soon, I have some more vband clamps and I have an xpipe that will be added as well as removing the resonator and installing c63 mufflers and getting rid of the clamps and installing the vbands.

bayhas

Awesome feedback, Thank you

If these are 49 state legal, and they dont cause CEL, then either these are unbelievable deal, or Kooks are offensively overpriced...

Do you have cat monitoring turned off?

E55amg0220

Nope mine are on 49 state legal and i passed emissions just fine .... that was the whole reasoning for me installing cats .... had to reregister in march an so put them on anticipating a prob but i have already passed an legal til next year now.

oneslow55

100, will yield best gains-2whp loss

200 ,will be good too will throw cel -8whp loss

400 ,will be good for inspections and won't throw a cel.-13 whp loss at times more depending on the brick used.

As far as greens go nothing can touch them as they can hold 900 whp with virtually no whp loss.