NHRA Trans Am

Could you pass emitions with long tubes and one cat after the y-pipe?

orangeapeel

iTrader: (18)

No....

RrCoX22

iTrader: (6)

that's a double no...
lt's = fail visual (depending where you live)
1 cat = fail visual (depending where you live)

orangeapeel

iTrader: (18)

Plus the cat will be too far back to perform it's proper function.

300bhp/ton

It might pass a sniffer test, but it wouldn't be as efficent. It would certainly fail visual.

But worst of all it'd choke the engine. It would totally negate having done any work on the exhaust at all and even with headers you would probably have a worse performing exhaust setup than stock.

2 Cats, one per banj is the way to go. Cammed/bolt on LS1's are fine with Mahanflow Carsound £2 core CATS.

More extreme setups would want Metal Matrix 3" core setups from Random Technology or Magnaflow.

If you're in CA it's a different story however, as LT's aren't legal.

ChocoTaco369

lol 1 cat serves no purpose performance wise, sound wise or emissions wise. it's a lose-lose

NHRA Trans Am

Thanks for all the help, I guess i will be running 2 cats.

67Firebird455

iTrader: (27)

First of all, where are you located? I thought of running LT's with cats at the collector, until I realized I would fail the ish out of visual in California, and probably fail the hell out of the sniffer test too. The smog ref said you cannot move the cats from their stock location and pass visual, period, they are put in that position for a reason, they have to be heated to a specific temperature to function correctly. Moving them back will cool them down and become less efficient. I said the F with it and yanked them off, ran an ORY and paid some guys to pass me (which is ridiculous btw). Smog for me is coming up in November, not looking forward to paying big bucks AGAIN with the turbo setup. I hate smog...

ChocoTaco369

run cats. nearly every exhaust on an LS1 sounds better with them. if this were a mustang forum i'd say go ORY, but it's not

bad6as

iTrader: (17)

are lt illegal in md

orangeapeel

iTrader: (18)

What kind of keyboards do you have over in England?

orangeapeel

iTrader: (18)

Not illegal persay, but not legal for street use.

300bhp/ton

Doh!

Standard UK layout QWERTY keyboard

This is totally user Error! I meant 3" which is the nummber 3 key and shift number 2 key for the " inch symbol. However I must have held shift down when I pressed the number 3 key which gave me the pounds Sterling £ symbol.

orangeapeel

iTrader: (18)

3 = # here.

I didn't know if you went and found that on a character map or if it was indeed on your keyboard. Cool fact.

300bhp/ton

Yeah UK layout is slightly different to US, but mostly on special characters. It's a PITA if some numskull has installed Windows and left the default as US layout.

orangeapeel

iTrader: (18)