11-06-2011, 09:55 AM | #1 |
Drives: Has Wheels Join Date: May 2011
Location: On Earth
Posts: 5,553
|
Question about JBA High Flow Cats fitment with Flowmaster American Thunder Catback
I am about to buy JBA high flow cats for my car. Right now, I have the Flowmaster American Thunder Catback that is 3", and obviously the stock manifolds are 2.5". I have the stock headers because my car is Turbocharged. So, would I need the JBA cats that are 2.5" at the manifolds but 3" where it connects to the 3" catback, ORRR would I need 2.5" for the manifold (same as the other option) and still 2.5" where it connects to my catback?
I've been told by a few people that the American Thunder catback (even though 3" throughout) necks to 2.5" where it connects to the cats. So, that would believe I would just need the 2.5" to 2.5" high flow cats, and not the 2.5" to 3" cats. Then again, some people tell me something totally different. So, is there anyone that actually knows which size I need to get . Thanks. |
11-06-2011, 10:38 AM | #2 |
knows 2 facts about ducks
Drives: ...and they're both wrong Join Date: Aug 2009
Location: The HMS Invincible
Posts: 25,072
|
JBA makes high flow cats that are 2.5" to 2.5" , 2.5" to 3" , and 3" to 3"
|
11-06-2011, 12:14 PM | #3 |
Drives: Has Wheels Join Date: May 2011
Location: On Earth
Posts: 5,553
|
Thanks Steiger, I noticed that as well.
I think the problem is that I keep getting conflicting advice as to whether I should get the 2.5" to 3", or the regular 2.5" to 2.5". Some vendors are saying that the American Thunder catback (which is 3") has a 2.5" neck down area to attach to 2.5" cats. So, that would mean I could buy the cats that are 2.5" to 2.5". Then others are saying the catback doesn't neck down to 2.5", and that means I'd have to buy the cats that are 2.5" to 3". Damn, this is confusing haha. |
11-06-2011, 01:10 PM | #4 |
knows 2 facts about ducks
Drives: ...and they're both wrong Join Date: Aug 2009
Location: The HMS Invincible
Posts: 25,072
|
easiest way IMO, and this is what I did when I had my JBA 3" exhaust, is to buy the 2.5" to 2.5" cats and then IF the exhaust doesn't bottle neck down to 2.5" your exhaust shop can fab up an adapter in about 30 minutes.
|
11-06-2011, 01:41 PM | #5 |
Drives: 2012 ZL1 - #670 Join Date: Jun 2009
Location: Seminole, Fl.
Posts: 8,009
|
Get the 2.5 in, Flowmaster are 2.5 in then goes to 3.0 ...
__________________
|
11-06-2011, 02:04 PM | #6 | |
Drives: Has Wheels Join Date: May 2011
Location: On Earth
Posts: 5,553
|
Quote:
|
|
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
MBRP Catback with High flow cats, video | bubblyjock | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 17 | 10-02-2012 06:09 PM |
Solo high flow cats on borla ATAK catback. | flashback | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 2 | 10-17-2010 12:59 AM |
High Flow Cats Question | Malan35 | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 16 | 10-06-2010 10:46 AM |
high flow cats exhaust leak question | zero | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 2 | 08-10-2010 08:33 PM |
Magnaflow High Flow Cats at an incredible price..and a few recommendations | BSPOT | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 17 | 11-24-2009 02:10 PM |