COBB Stage 2 with catback and HFC
#1
Newbie
Thread Starter
Join Date: Mar 2008
Location: Eastern US
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
COBB Stage 2 with catback and HFC
I was wondering if I could use COBB Stage 2 map with just a catback and hi-flow cat and keep the stock downpipe(I also have a AEM intake)? If not what HFC to use I want quiet? Are there any one piece downpipe/HFC cat combos that are quiet I see Invidia has a one. Had one on my STI and that worked well. Thanks.
#2
Evolved Member
Ultimate Racing, ETS, and I am sure a couple others sell 3" hi flow cats that should work well. Your stage 2 might work okay with that set up, but I would really put a down pipe as well, particularily if you are considering a one piece down pipe cat assy. The downside with that option is that when the cat goes, you have a downpipe to replace, in addition to the cat. I prefer the UR downpipe, or the ETS style tubulars over the AMS downpipe. The reason is simply that the AMS down pipe, while the quality it top notch all the way, is pretty heavy. I will say though after installing an AMS down pipe for a friend of mine, that their downpipe will likely out last the car by a century or two.
#5
Evolving Member
iTrader: (1)
Join Date: Dec 2005
Location: Freehold,NJ
Posts: 387
Likes: 0
Received 0 Likes
on
0 Posts
You can always buy a test pipe and bring to a fab shop and have them make weld on a resonator for quietness. Thats what I did to mine and brought it to Akuma Motorsports in NJ. They do great work there at a good price.
#6
Evolved Member
iTrader: (12)
Join Date: Jan 2009
Location: Massachusetts
Posts: 552
Likes: 0
Received 0 Likes
on
0 Posts
The main restriction is from the cat, not the DP.
I am currently running a Perrin CBE, AMS HFC, stock DP & O2 housing, AEM CAI, and the Cobb Stage 2 tune (for the AEM intake & with the boost pill removed) for at least 6 months now...the car runs mint and I've haven't seen any CEL's yet.
#7
I don't agree with this statement. I've read many threads and seen quite a few dyno sheets showing the stock DP flows just as well as an aftermarket DP, when the stock O2 housing & stock turbo are used. Waste of time and money just swapping out the DP without changing out the O2 housing as well.
The main restriction is from the cat, not the DP.
I am currently running a Perrin CBE, AMS HFC, stock DP & O2 housing, AEM CAI, and the Cobb Stage 2 tune (for the AEM intake & with the boost pill removed) for at least 6 months now...the car runs mint and I've haven't seen any CEL's yet.
The main restriction is from the cat, not the DP.
I am currently running a Perrin CBE, AMS HFC, stock DP & O2 housing, AEM CAI, and the Cobb Stage 2 tune (for the AEM intake & with the boost pill removed) for at least 6 months now...the car runs mint and I've haven't seen any CEL's yet.
Trending Topics
#8
Newbie
Thread Starter
Join Date: Mar 2008
Location: Eastern US
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the info. I too believe that the stock cat is where most of the restriction is and will probably do the HFC first and see how it runs and sounds. First I have to figure out why my car last night went into limp mode and threw a CEL. I never had any issues before with the COBB stage 1 AEM map before. Thanks again.
Thread
Thread Starter
Forum
Replies
Last Post
EEVOH
Northeast Region
2
Aug 27, 2015 07:02 PM
EEVOH
For Sale - Engine / Drivetrain / Power
5
Aug 27, 2015 07:01 PM