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Old 10-23-2001, 03:28 PM   #1
WRBLUEWAGON
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Location: Palm Coast FL via NJ
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2006 VW SUV

Question BPM GT Turbo Back Exhaust Questions??

So this is my deal. I love the BPM down pipe design and the looks of the muffler. I like the quality and fit and finish. Here are my questions.

1.) Is it much more quit with the silencer on it? ( I heard one with the silencer off)
2.) Do you have to cut the heat shield around the turbo to fit it in?
3.) Will I get CELs from the exhaust with the stock up pipe?
4.) Will I need to cut or move anything to install the exhaust?
5.) Is it ok to run with out the heat shield around the turbo?
6.) What Turbo back exhaust with a hi-flow cat makes the most power?

What are your thoughts about the Other Turbo backs (MRT, M2, AVO Turbo World, Scooby Sports, APS)?

Which is the quietest one on the market?

Eric
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Old 10-23-2001, 03:48 PM   #2
Dexter
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Default Good questions...

... but I will let the specialist add their comments.

I pretty much narrowed my decision to BPM. But I would also like to know which is the quietest out of all the BPMs. I know M2s and MRTs are pretty quiet but their fit and finish are not as nice as BPM's (from what I am hearing in these forums).

There was a post a while back which had wave files of the number of exhaust systems available. I couldn't really tell how loud they were (ScoobySport and BPM MKiii sounded like they had some decibels) or if they were cat or turbo backs.

I've heard a few people received CELs after 1000 miles or so. This is of concern with me.
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Old 10-23-2001, 04:15 PM   #3
jwaters
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1.) Is it much more quit with the silencer on it? ( I heard one with the silencer off)

Yes, much. It is near stock levels with the silencer in.

2.) Do you have to cut the heat shield around the turbo to fit it in?

Yes, but it takes 5 minutes if you have a decent pair of metal cutters.

3.) Will I get CELs from the exhaust with the stock up pipe?

Not if you put the second 02 sensor after the included cat.

4.) Will I need to cut or move anything to install the exhaust?

Maybe not. I had to do some trimming to get it to line up nicely with the turbo- but you might get lucky.

5.) Is it ok to run with out the heat shield around the turbo?

Why not try it and find out? Most likely you will heatsoak your I/C faster and kill the power a bit. Won't damage anything though.

6.) What Turbo back exhaust with a hi-flow cat makes the most power?

Who knows for sure? The BPM is one of the best.

Joe
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Old 10-23-2001, 04:23 PM   #4
WRBLUEWAGON
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Thanks Joe, for your reply. (Very well done)

Anyone else with replys would be great.

Eric
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Old 10-23-2001, 04:28 PM   #5
WRBLUEWAGON
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Joe,

One more question. Is there a hole to install the 02 after the cat on GT Exhaust or do I have to have one put in.

Eric
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Old 10-23-2001, 05:12 PM   #6
midlifecrisis
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Eric,

I concur with Joe. Forgive me for not being as succinct.

The BPM systems should all ship with the O2 sensor bung after the cat. There was a time (before June) that they did not and many people were getting CELs. I still read the occasional post complaining about CELs after installing the BPM exhaust. Who knows if they would have gotten a CEL without the exhaust? In my case, there have been no CELs since installing my BPM (~7000 miles on the exhaust now).

Regarding the sound issue, the silencer makes the system very quiet. However, I believe it to be at the expense of power. This is a butt-dyno personal opinion though. I threw my silencer away.

I have seen the M2 twin tip exhaust on another WRX. It takes an educated eye to know that it is not stock (definately an upgrade though). There is a nice rumble but fairly quiet.

Who knows which one provides the most improvement? I doubt it makes much difference unless you add a bigger turbo, etc.

Good luck with your search.

Paul
red02wrx
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Old 10-23-2001, 05:44 PM   #7
WRBLUEWAGON
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Paul,

Thanks for your feedback. I'm going to get one. I'm also going to get the uni-chip down the line. How is your set up with the uni-chip. Do you have any 1/4 times.

Thanks
Eric
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Old 10-23-2001, 05:46 PM   #8
Conduit
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Default

As an aside, Greg has said that the silencer makes no power difference at all. If you look at it's design, it's designed to "seal up" the small holes in the inside of the muffler, not make the hole smaller like most silencers. I measured 2mm less overall diameter with it in...pretty impressive. I am also getting the same trap speeds with it in. The only problem I notice with the silencer is that I am now overslipping the clutch because I am so used to the sound of the exhaust! On the upside, people can now talk in my car at full throttle without having to shout and hold their heads in pain (which I liked too )
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Old 10-23-2001, 05:50 PM   #9
redobs
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You will need a plug for the first O2 sensor bung. It is still there. I would suggest getting it from whomever you get your exhaust from. I got mine from Mike @ Exeter.
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Old 10-23-2001, 06:04 PM   #10
midlifecrisis
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Conduit,

As I said, the power I believe I lose is based on a butt-dyno personal opinion. I'm afraid I have no real data. However, your silencer must be different than mine. My silencer reduces the exhaust diameter in the muffler section to 2.25". This is roughly a 19mm reduction.

Eric,

When you get your system, let me know; I have a fairly complete set of instructions. I suggest you buy it from Mike at Exeter Subaru. He gives excellent customer service.

I am still working through some issues with my unichip. Specifically boost variations based on outside temperature changes. Mark at TurboXS has been excellent to work with and I'm sure I will be able to review it soon. In any case, I have no 1/4 mile times yet.

Paul
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Old 10-23-2001, 06:13 PM   #11
TurbosOnly
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I installed the BPM GT turbo back a week ago. It fit perfect w/ no modifications other than the heat shield which hasn't gone in yet. I haven't noticed any difference with the heatshield not being there but I'm going to put it back anyway.

I am real happy with the BPM Gt overall. Thanks to Midlifecrisis for the detailed install instructions. Too anybody that will be installing any turbo back exhaust on this car, beware of the turbo nuts and bolt/studs. They tend to strip. Make sure you lube them well and hand-tighten when reinstalling.

Richard
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Old 10-23-2001, 10:17 PM   #12
AutoNthusd
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Default Relocation of O2 sensor

I understand that the 02 sensor wiring is not long enough to reach the cat if it is not in the downpipe position. Is their an extension harness available from BMP to allow for proper install of the 02 sensor?

Ed
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Old 10-23-2001, 10:35 PM   #13
redobs
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Exeter did my install, but I believe that it is long enough. I think you just have to cut something so that you move the O2 sensor far back enough. Here's a pic:

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Old 10-23-2001, 10:46 PM   #14
midlifecrisis
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Richard,

You are very welcome for the instructions: my pain - your gain I will be updating them to caution others about your turbo stud issue: OUR pain - others gain!

Ed,

You will have a hard time believing it when you do the install, but the O2 sensor wiring IS long enough. You will have to release it from its tethers well into the engine compartment.

Paul
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Old 10-24-2001, 11:04 AM   #15
WRBLUEWAGON
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Paul,

Where is Exeter?

I'm thinking to have a pro do the install. If this is a Subaru dealer I would be will go drive to it and have them do the install.

I feel a lot better knowing that the slincer will quit things down. The one I heard was very loud but did not have the slincer.

Thanks for your help and if you can email me the directions that would be great.

elyublinsky@vital-computer.com

Eric
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Old 10-24-2001, 01:17 PM   #16
redobs
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I'm not Paul, but I can tell you where Exeter Subaru is. They're located in Exeter, NH.(duh!) Here's their website for directions: www.exetersubaru.com. Just for reference, they're about 1 hour north of Boston. They charge 2 hours labor @ $59/hr for a muffler install. If you decide to get it done there you can also order your exhaust from Mike, and they can have it there when you go up. So, there will be no shipping the exhaust and having to lug it up there.

877-SUBARU9 Ask for Mike or Bill in parts to order the exhaust. Ask for Ethel or Scott in service to set up an appointment. You have to set up an appointment if your gonna get it installed. They are extremely busy up there.
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Old 10-24-2001, 01:30 PM   #17
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