SuperSprint X-Pipe + Dinan exhaust = bad combo? - BMW M5 Forum and M6 Forums
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post #1 of 29 Old 21st September 2008, 09:13 PM Thread Starter
avi8tir
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SuperSprint X-Pipe + Dinan exhaust = bad combo?

As a result of my AFE intake experiment this weekend, I found out my car is not putting down the power that it should be. Baseline was about 380 rwhp with RPI scoops, bmc filters, SS Xpipe & Dinan exhaust. I have heard of certain combinations of mods that actually reduce power instead of making more power. Could the SS X-pipe and Dinan exhaust be a bad combo that is actually making me lose rwhp? One thing that worries me about the SS X-pipe is that it makes no performance improvement claims. Usually there is at least a claim of a couple of hp. Is it a flawed design??

unfortunately I dont have a dyno of my car when it was stock. thinking about switching to the Dinan mid-pipes to see what happens.

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post #2 of 29 Old 21st September 2008, 09:30 PM
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I can feel your pain and frustration. I think i already post the same comment on your 3 diff threads, but sure why not again...

If I were you, I would start by checking for exhaust leak on this current setup, then put back stock resonator, then dyno again.

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post #3 of 29 Old 21st September 2008, 09:33 PM
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We had the discussion about the possibilities of bad results when
mixing different exhaust components. From collective experience I think
we can agree that the section 3 doesn't really add or subtract significant
power. The scoops/bmc/cf filter combo definitely adds power. From the dyno numbers it looks like your car is down a significant amount compared
to other cars.

Unfortunately it seems like the only way to really know is to swap the
x-pipe back to the stock resonator-xpipe. Either that or a thorough check
to ensure you have no leaks or other problems...or maybe even a
second "opinion" on a different dyno? The last being the easiest thing
to do...the others being a pain in the @ss.

I'd love to see and hear what the Dinan midsection sounds like with the
Dinan section 3. I would go this combo but it's not available for the M6
and I'm a little disappointed with the pricing. Offered without high-flow
cats the price point feels about 1k too high. But I suppose you have to
pay to play.
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post #4 of 29 Old 21st September 2008, 09:52 PM
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Different dyno first, then replace x-pipe with stock. I am curious to see a hp difference but I don't think it is the x-pipe.

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post #5 of 29 Old 21st September 2008, 10:01 PM
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Quote:
Originally Posted by tjav8b View Post
Different dyno first, then replace x-pipe with stock. I am curious to see a hp difference but I don't think it is the x-pipe.
Initially we thought something wrong with the Dyno machine, then we dyno another M5 about 30minutes later with scoop and section3 exhaust, and he pulled 412whp. But yes, it would be nice to try to different dyno like DynoJet which many people have an idea on what baseline number expected.

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post #6 of 29 Old 21st September 2008, 10:11 PM
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Quote:
Originally Posted by keang24 View Post
Initially we thought something wrong with the Dyno machine, then we dyno another M5 about 30minutes later with scoop and section3 exhaust, and he pulled 412whp. But yes, it would be nice to try to different dyno like DynoJet which many people have an idea on what baseline number expected.
I would not even bother with another dyno, this is enough proof. It would be very interesting to see if the x-pipe could cause a hp loss like this.

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post #7 of 29 Old 21st September 2008, 10:33 PM
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put back on stock airbox first.....then dyno.

then put back on stock xpipe and then dyno....
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post #8 of 29 Old 21st September 2008, 11:01 PM
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Thanks for posting this. I've been modding cars for years and I've got to say that the exhaust mod options for the E60/M5 are tricky.

Firstly, OEM exhaust as a complete end-to-end unit is already very good. If you're gonna swap out exhaust sections then I'd stick with a single vendor who has tested their products in the exact configuration you're seeking.

There are lots of good aftermarket options but mixing vendors is risky.

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post #9 of 29 Old 21st September 2008, 11:10 PM
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Please stop belaboring the exhaust issue. It is insignificant and of no relevance.
The AFE intakes are useless period end. Move on.
If you want to buy the Dinan intakes be my guess, no comments.

You all know where I stand and it works!
Please excuse me but I am just an "f'en idiot" who deals in the truth.

Cheers gentlemen,

Ranger

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post #10 of 29 Old 21st September 2008, 11:49 PM
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It is relevant as the apparent power loss has nothing to do with the
AFE intake. If you have information about why it cannot be the
exhaust combo then please share this with us.

The intake was brought up as the reason for dynoing but it's the
baseline dyno that is in question and not the subsequent AFE dynos.
That's the subject of a different thread.

Quote:
Originally Posted by M5Ranger View Post
Please stop belaboring the exhaust issue. It is insignificant and of no relevance.
The AFE intakes are useless period end. Move on.
If you want to buy the Dinan intakes be my guess, no comments.

You all know where I stand and it works!
Please excuse me but I am just an "f'en idiot" who deals in the truth.

Cheers gentlemen,

Ranger
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