bonknhead

I think I need to replace the stock catalytic converter on my TL-S. It has 142k miles and is making that rattling sound at low speeds when I step on the accelerator a bit. The rattling sound is a little less pronounced once the exhaust system is warmed up a bit. The problem sounds exactly like what another Azine member posted recently and was resolved by a new converter. Heat shields seem to be securely fastened.

My dilemma: what is the consensus on replacement catalytic converters? I'm looking for a high flow one since I'm running headers. i know it won't make much of a difference, but looking for a good replacement for a TL-S, size-wise. Thanks.

Mineme

Well Im replacing my cat here soon, Im also thinking High Flow, I found a direct bolt on one, http://www.convertershack.com/produc...tic-converter/ But you can find a cheaper one that you need to weld on (not direct fit).

bonknhead

Thanks, but since the information on that one doesn't list the inlet or outlet diameters, it might just be for the TL-P, not TL-S. I know that 1/4" isn't that big a difference but I'd like to not restrict any flow it at all possible. I believe TL-Ps have an exhaust diameter of 2 1/4" and TL-Ss have an exhaust diameter of 2 1/2".

bonknhead

Any other suggestions for a high flow cat for a TL-S? I didn't want jack Mineme's since he's looking for a HFC for his TL-P. Any feedback on Excelerate's HFC as to fit, sound, and cost vs other options?

Karanx7

iTrader: (2)

From what I understand, the new XLR8 HFC is pretty good in terms of quality and it will pass emissions. The exhaust will sound a little more raspy however, so beware of that.

But if all you're trying to do is get rid of the rattle, you could fix it without replacing the entire cat. Inspect the bolts and general area of exhaust. Something is loose if there is a rattle, and replacing the cat is a little bit of a jump.

bonknhead

Thanks Karanx. The reason I made the jump to replacing the cat was due to another thread where his rattle sounded just like mine and it was due to an inside element coming loose in the thread:

"Exhaust Rattles 2400 to 3000 rpm" .

nats007

If you are going aftermarket, I think it only depends on your inlet/outlet dimensions you need and you can get it welded in. Here are several with 2.5" in/out:

http://www.summitracing.com/search/d...tic-converters

If you want to keep OEM, I'd try a salvage yard or car-part.com. I had 2 OEM cats for my RSX because I gutted one out after it failed (currently on my car) and another one I picked up for $50 off a forum even though they retail over a grand!

bonknhead

Thanks Nats007. Magnaflow is a good brand. I don't know anything about Catco. I'll go to the neighborhood Ed's Mufflers (the manager there is cool) and see if they can diagnose if the rattle really is from the catalytic converter.

Excelerate

iTrader: (1)

If you're looking for a high quality high flow cat I'd recommend our XLR8 unit.



XLR8 T304 Stainless Steel High Flow Cat 2.5" IN/OUT (200 Cell Metallic Substrate)

http://hoa.excelerateperformance.com...i-1885514.aspx

bonknhead

I know the quality of the items you carry - I've purchased from you before so I trust what you sell - but that's a steep price for an HFC, about twice what I was planning to spend. Thanks though.

bonknhead

It was the catalytic converter. Replaced it with a hi-flow one from AP Exhaust and rattle is gone!

3.2TLc

Approximately how much did the AP cat run ya ?
Is there much difference in sound ?

Excelerate

iTrader: (1)

I understand.

bonknhead

$300 installed. Physical limitations for me prevent me installing it myself. Sounds like when I first put the headers on - deeper than stock, but now no rattle!

Oakroadsteve

K7....Mine rattles badly and I was considering a high flow or a test pipe (If I recall the test pipe smells and sounds raspy)....I would much rather do the fix on the current unit if it is merely locating and tightening some bolts..You know these cars as well as anyone on this site. What should I look for when I get my car up on a lift?