MMP M62B44 Build Project "Jack-N-Coke"

[LJ851]

180 degree headers. Do it.

[MonkeyMadness]

No I understand that. I just want that tight euro v8 sound. And I mean tight as in well built, presision, euro grawl..
What I am more interested in with the X pipe is performance. Seems like everyone on the Internet has there own pros and cons. And there is a shit ton of dyno sheets proving either or is a better setup. I was just looking for some R3v input on it.

[JGood]

Well, the theory is to help exhaust pulses flow, one cylinder pulling the next, but considering the design of the stock vanos manifolds, that theory mostly goes out the window IMO. I didn't notice any difference when I put my xpipe in, but my butt dyno isn't calibrated to the ~5whp or so that an xpipe might give you...

I think the place to really get power out of these engines is the manifolds. I have no proof of that other then the fact that the e39 m5 uses e34 manifolds, and even they can see huge gains with aftermarket headers. So the vanos manifolds must really be junk...

[The Dark Side of Will]

The exhaust has a lot to do with sound... but so does the exhaust cam and firing order... so if you're running production manifolds and production exhaust cams, the foundation for sounding like a production engine is there.

The C6 ZO6 and ZR1 sound notably different. The ZO6 has an H-pipe, the ZR1 has an X-pipe.

For best effect, the X-pipe needs to be as closer to the manifolds as possible... getting it closer than 5 feet in a BMW is difficult.

[JGood]

The C6 ZO6 and ZR1 sound notably different. The ZO6 has an H-pipe, the ZR1 has an X-pipe.

One also has an LS7, the other an LS9...


I wish my m6x sounded like either!

[LJ851]

No I understand that. I just want that tight euro v8 sound. And I mean tight as in well built, presision, euro grawl..
What I am more interested in with the X pipe is performance. Seems like everyone on the Internet has there own pros and cons. And there is a shit ton of dyno sheets proving either or is a better setup. I was just looking for some R3v input on it.

180 degree headers sound much more refined and euro in my opinion. It eliminates two power pulses hitting the collector at roughly the same time which gives the uneven, rumbly sound.

Would probably be a big pain in the ass to do on a V8 e30.

[MonkeyMadness]

I've been listening to everything I can come a cross I like this one allot

[The Dark Side of Will]

One also has an LS7, the other an LS9...

I wish my m6x sounded like either!

They use the same head castings... hard to get much more apples to apples than that.

[JGood]

They use the same head castings... hard to get much more apples to apples than that.

The LS9 is based on the LS3. I've never held either heads in my hands to know if they're the same casting, but the LS7 has different port dimensions, among other differences.

[The Dark Side of Will]

The LSA from the CTS-V is more like a supercharged LS3. The LS9 has piston oil squirters, titanium rods, etc, and is a lot more than a supercharged LS3.

Pretty sure they use the same castings. The LS7 heads have small chambers, while the L92 heads have (don't know the casting #'s right off) have the same ports but larger chambers. I'm not sure which the ZR1 uses.

I think both LS9 and LS7 are CNC ported, but I believe the LS7 uses larger intake valves, which are enabled by its larger bore.

[JGood]

I think both LS9 and LS7 are CNC ported, but I believe the LS7 uses larger intake valves, which are enabled by its larger bore.

Right, and differences like that (along with the 6.2 vs 7.0, the supercharger, etc....) will probably have more of an impact then x-pipe vs h-pipe... that's all I was getting at.

[The Dark Side of Will]

I disagree. The X-pipe has a big impact on sound. I went from duals to X-pipe on my Northstar Fiero and the change in sound was significant. Even my girlfriend can tell the difference between my car and a loud Mustang just by sound when both cars are out of sight.

Can you tell the difference in sound between an LS1, and LS2 and an LS3?
There's more difference among those engines than there is between the LS7 and LS9. The 7 & 9 even use the same exhaust manifolds.

That being said, there are a LOT of different formulations of both X-pipe and H-pipe and each one's going to sound slightly different... however, overall X-pipes have a certain character and H-pipes have a certain character and I think MM would like an X-pipe more. As I mentioned earlier, the big improvements from an X-pipe in terms of keeping power while reducing noise come from having the X as close to the manifolds as possible, which is difficult in a BMW. I can do it in the Northstar because the front bank manifold goes straight under the oil pan.

AFAIK, the BMW manifolds are unique in the cross-plane V8 world.

[JGood]

I disagree. The X-pipe has a big impact on sound. I went from duals to X-pipe on my Northstar Fiero and the change in sound was significant. Even my girlfriend can tell the difference between my car and a loud Mustang just by sound when both cars are out of sight.

Can you tell the difference in sound between an LS1, and LS2 and an LS3?
There's more difference among those engines than there is between the LS7 and LS9. The 7 & 9 even use the same exhaust manifolds.

That being said, there are a LOT of different formulations of both X-pipe and H-pipe and each one's going to sound slightly different... however, overall X-pipes have a certain character and H-pipes have a certain character and I think MM would like an X-pipe more. As I mentioned earlier, the big improvements from an X-pipe in terms of keeping power while reducing noise come from having the X as close to the manifolds as possible, which is difficult in a BMW. I can do it in the Northstar because the front bank manifold goes straight under the oil pan.

AFAIK, the BMW manifolds are unique in the cross-plane V8 world.

OK, well like I said, I put an x-pipe on my m6x e30, which is what the OP is also considering, and it made no noticeable difference in sound or performance. I think that's the topic at hand...

[LJ851]

[The Dark Side of Will]

OK, well like I said, I put an x-pipe on my m6x e30, which is what the OP is also considering, and it made no noticeable difference in sound or performance. I think that's the topic at hand...

For best effect, the X-pipe needs to be as closer to the manifolds as possible... getting it closer than 5 feet in a BMW is difficult.