I couldnt find an exhaust forum so I hope this post is welcome here.
I have an XC with Genie try Y extractors and before you tel me to get rid of them let me say that I have just had them ceramic coated so they are here to stay.
My question is: Is there really anything to gain by installing a 2.25" exhaust when the extractors collect into a rather long 2" pipe?? My engine guru has reccommended a 2.25 twin system with straight thru mufflers and a X pipe. Anyone run similar? Any good?
I am steering towards a 2 inch: 1. because of the extractors and 2. because I have a rather nice set of N.O.S genuine Ford stainless steel exhaust tips which look fantastic. The motor is a fairly warmed over 351 with a largish Crow cam, roller rockers, ported heads, balanced, 750 Vac. etc. Will I be selling my self short with a 2" system or will it not make that much difference. I think it will look weird going from 2" collector to 2.25" exhaust.
And before anyone tells me to buy them, I used to have the 4 into 1 Hurricane headers and they had a 3" collector going into a 2" exhaust and I hated the way they scraped on everything. Noticably better top end, but you had to give it more throttle to get off the mark.
fOR A FAIRLY MILD MOTOR LIKE THAT THE 2INCH ARE OK. IF you go 2/12 you will lose bottom end like you did with the 4 into 1's. How would I know? Ive tried every combo known to man kind over many years. My xc runs high 11's with tri y's.
The 180- degree headers give a V-8 the same sound as a 180-degree crankshaft or V-12. They also look impressive. They do have some tuning advantage and a few more horsepower. But, this design almost allways comes out with very long primarys.
I run twin 2 and 1/4 pipes, fed from pacemaker tri -y with tripple flow mufflars and no cross over pipe. The last dyno was 200rwkw. The engine dropped off at high revs because of the tripple flows. I have been recommened to run straight through mufflers and a balance pipe or upgrade to twin 2 1/2 with tripple flow mufflers. Since the exhaust is new, I'm going for the balance pipe and straight through mufflers. I should do this before xmas. I let you know how I go.
yes, so I have been told but is there anything to be gained by going to 2.25 inch over 2 inch when my extractors have long 2 inch colector. For those with little or no maths: 2.25 = two and a quarter inch. This question did not seem to be understood judging fromt the replys.
Get the exhaust shop to change the extractor collector to 2 1/2", then go your 2 1/4" system. If thats what you want?
I run 4-1 pacemakers (3" collector? It's big), twin 2 1/2" system, balance pipe, tripple flow mufflers and did 230rwkw on Hallam Performance's dyno with a slipping auto. Which equated to my email@example.com (pipes on, aircleaner on etc). Basically I ran 3500rpm histall and 4.11's and the 60ft's sucked (1.9's). I've changed quite a bit since and should run sustancially faster next time.
Bottomend power is where clevelands lack. The induction system/heads don't flow well @ low rpm. They get going around 2500rpm. It also depends on your camshaft. No point putting in a performance cam for bottomend. As all performance cams do is require an increase in rpm to work. So install hp cam bang, you need more rpm.
 more flow will always equal more power but only if your engines exhaust flow currently being restricted.
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