These questions are for everybody really...

Can one run the Cobb Stage 2 "out of the box" tune with the AMS down pipe, or would one have to get a custom tune? I also have read that those O2 housing bolts are a real b!tch, how much tougher would the install be opposed to the Perrin DP?

One more question, I don't plan on running a test pipe, but I would like to go with an aftermarket high-flow cat. Is there something out there that would fit with the AMS DP and a Perrin CBE ?

 

Someone got it right!

The 02 housing is where the power is at! The down pipe replacement itself, we don't sell because it does not provide any benefit! This is the reason we made the 1 piece o2 housing and down pipe

 

I don't believe that a larger o2 housing will get you 15whp. In fact if AMS will guarantee a 15whp gain from their o2 housing I will buy it today and apologize to everybody for my ignorance. I'm actually looking for a power upgrade and I don't want to go with the test pipe. I could be wrong here but I just can't imagine a 15whp gain from the o2 housing. Does the X yield significantly better gains from the o2 housing than the IX?

 

I cant guarantee any HP gains, because it will be dependent on your setup. Like you mentioned though, the o2 housing here is much different than the IX. I can tell you that we tested each part, the down pipe had no gains, the o2 housing with the down pipe did give us good gains. I'd say anywhere from 5hp to 15hp is completely reasonable and depends on the rest of the parts that are on the car, just like any other modification you can do. We all know that you can't just take the manufacturer's advertised gains, and just add them all up and expect your car to gain 100hp with bolt-ons!

A test pipe is not necessary for the car to make good power. You can run our high flow cat and get the same gains. We changed from a test pipe to a bullet style cat on our USCC winning EVO X at 470whp, and it didn't lose even 1 horsepower!

 

Hey AMS, any combo deals on the O2 housing/dp and high flow cat???

 

I always though that a test pipe or o2 housing wouldn't get me much so I never considered either. I would be sold on an o2 housing if we're talking 5-15whp gains but not 5-15hp gains.

 

Everyone is making their exhaust pieces to match oem flanges, so you can look at my setup. I have an AMS tp bolted to a Perring CBE which is for sale, and the o2/dp is not difficult to install, it just requires patience and know how.

 

It's definitely WHP gains! Of course the gains are all based on setup, but if you have a good free flowing setup already, you could easily see 10-15whp gains.

I actually have the ETS o2 / downpipe which is also a very nice peice. I would go with either AMS or ETS as I think they have the best quality o2 peice.

 

cris,
so any discount on the o2 dp and hfc?

 

The AMS O2 / Downpipe combo is cast and there are no welds in the parts that bolt up to the turbo. Should resist cracking better than the tube pipes. It’s a magnificent piece of engineering, I recommend it wholeheartedly. I’m running one with just a HFC and a Cobb AP. Unless my butt dyno is completely out of whack, it indicates my car pulls harder and spool-up seems quicker. I doubt it’s just a 5 hp gain, not even my BD would notice only such a small bump in power.

 

I would go with the AMS downpipe. If you are looking at a "turbo-back exhaust", start from the turbo back. First piece is the O2 housing ... Would be easier to install the AMS downpipe and then install hfc or test pipe later, than going with Perrin downpipe and trying to install O2 housing later. Plus the AMS piece is cast which should flow slightly better and be more durable.

 

AMS and most manufacturers are not going to guarantee a specific gain. There are too many variables: supporting mods, dyno type, dyno testing procedures, environmental conditions, and so on. 5-15whp is decent gains from a bolt-on part especially if most of the power band is experiencing those gains. Be a little wary of Perrin's gains. They make quality parts but keep I'm pretty sure they use a dynapack for testing which usually reads higher than the other types of dynos.