mopar race exhaust on a gen 4?

Siciliano15

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Tried doing a search on this but havent really found a definite answer.... The race exhaust advertised for 2003-2006 cars (4510176), will it bolt up to a 2008-2010? I know the car is the same but did the factory exhaust manifolds exit at the same location and were any hanger locations changed? was hoping maybe someone on here has done it... thanks.
 

MoparMap

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Hmm, I didn't realize they didn't list them for gen 4 as well. I would have thought they would bolt up the same, but if they didn't the only reason I could think of would be the manifold exits. Do you have stock manifolds on your car now or headers? As far as hangers I'm fairly certain they are the same between the gens. The rear hangers on my car were single hole and the race exhaust uses the dual hole isolators instead, but I just used the dual hole hangers that are at the front in the back since you don't use the front ones anymore when the rear cats are removed (which the race exhaust will do). That would just leave the ****** interface to worry about. If you have headers though, that becomes less of an issue as you'd have to adapt the exhaust to your headers anyway and you wouldn't be using the flex pipe section that comes with the race exhaust.

For what it's worth, the parts manuals show basically the same part number for the cat pipe assembly between gen 3 and gen 4 though (goes from AC revision to AF revision, but the number is the same, so that usually means they are interchangeable). Based on that I would like to think the manifold exit is probably in the same location. I wonder if the only reason they don't list fitment for gen 4 is because of tuning? That or the parts just came out so early that they never bothered to update the description to say they worked on both.
 
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Siciliano15

Siciliano15

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Yea I have the stock manifolds. Funny I was actually thinking the same thing about how the part numbers on the factory midpipes are basically the same besides the last letter and also was looking at a few aftermarket companies like for example the belanger system that gives you the midpipes and exhaust and for the 2003-2006 the part number is 5625 and for 2008-2010 it's 5625-1 so it must be very cllose....
 

MoparMap

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The only difference I saw between the pictures in the manifold is the "early" midpipe shows an isolator with a single hole and hanger and the later one shows the dual hole setup. I think they are fully interchangeable if you just swap out the isolator though, so maybe that's why there is a very minor difference. It's not a 100% direct swap, but easily retrofitted kind of deal. Maybe even a running change through the years? I know I had the two hole isolators at the front of my car, but by the parts manual it looks like maybe I shouldn't have, so hard to say. I think it's a pretty safe bet the race exhaust would work on a gen 4 though.
 
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Siciliano15

Siciliano15

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I think it would probably work too just hesitant because I haven't seen anyone who's done it before. Maybe I'll just give it a shot.
 
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Siciliano15

Siciliano15

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Thanks for all the good info I'll let you know how it goes once I get it and go to install it.
 

MoparMap

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I would have thought this is what the ACR-X race cars ran for exhaust from the factory, so seems like it would be a natural fit. Granted I think those cars had long tube headers out of the factory as well, so maybe it's not the best comparison.
 
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Siciliano15

Siciliano15

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Yea I'm not sure what exhaust the acr-x had but it definitely came with headers and no cats. Was rated at 640hp and 605ft-lbs so a decent gain for only exhaust work and a different pcm probably similar to the Mopar pcm.
 
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Siciliano15

Siciliano15

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Just got the Mopar race exhaust in the mail today. System looks great. The system has the hangers in all the right places and the bends and pipe lengths appear to be where they should be.

Only teeny difference is where it mounts to the factory exhaust manifold. The angle of where the manifold goes into the midpipe is like a 45 degree angle instead of a more abrupt transition but it looks like it still ends up at the same size just a more gradual angle. Not sure of how that clamp holds the pipes together but I think it may work.

Another thing I noticed I took a pic of, at the end of the exhaust tip on the inside there is this little **** that gradually reduces the pipe diameter from 3" to 2.25" for about an inch or so and then goes back to 3" right before the pipe's exit... What's that about? Seems like it would be a big restriction. It's only tack welded in there in 2 spots...
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MoparMap

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Huh, that's odd. I don't think I recall my setup having that end restrictor thing on it. Pretty sure mine was just straight bent pipe for the exit tips. I agree that seems like a pretty odd addition to what is supposed to be a less restrictive exhaust.
 
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Siciliano15

Siciliano15

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yea thats what i thought too! 2.25" exit is even smaller than stock. I know they say that if the exhaust exit is slightly smaller than the rest of the system its ok since the gasses have cooled and become more dense but i think taking 3/4 of an inch off seems to be way too much.
 

MoparMap

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Yeah, I'd be tempted to just cut those out while you're there. I don't think I've ever seen them before. Just seems strange, almost more like a sound restrictor or something to hit a certain volume level for testing or something like that.
 
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Siciliano15

Siciliano15

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I've been trying to see if any other Mopar or borla exhausts have that but haven't found anything online or any pictures anywhere. I'll most likely cut them off and save them or maybe start it up with them there and then cut them off and see if the sound changed at all but I didn't spend the money for a smaller exhaust lol so I have a feeling they will definitely be gone soon.
 

MoparMap

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Yeah, I probably would as well. I still can't figure that one out. I don't think I've ever seen an exhaust tip that looks like that before on any Viper I've ever seen, and I've seen plenty with a race exhaust at track events. Could always potentially make your own tips as well. It's basically just a bent pipe with an angled cut on it, so fairly simple to fabricate if you have the right bend. Could use what you have as a template and go to a custom exhaust shop near you to see if they could make one up.
 
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Siciliano15

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Wish I could contact whoever is designed it and find out what it's true purpose is lol.
 

MoparMap

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My impression was that the system was made by Borla, but I could be wrong. The "street" system that was sold looked exactly like the Borla aftermarket system they sold (same muffler style), it just had different tips on it. The Borla kit had finished tips with a rolled edge and the Mopar kit was just straight cut. The race exhaust I have at least has identical muffler design (4 perforated tubes in one larger tube), so I assume it might be the same, but I suppose that design might not be unique to Borla.
 

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