I've just recently bought an AUXR8 and was wondering what are the best extractors to fit to this car. There are so many on the market, are there ones alot better than the others???? Do they really help in the top end breathing.
Also what is the best diameter for the exhaust?? 2.5 or 3 inch or bigger?
My au2 xr8 ute runs factory extractors and almost full twin system,ive heard these extractors arent as good as aftermarket onesand am looking at changing the whole system too...I too wanna know what other people have used and how much it cost them and what gains they got...
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Well, whatever place you talk to is the best......
But, in reality, a twin 2 1/4" or 2 1/2" the whole way is the best, D&T Exhausts say they're worth 10-15Kw at the wheels, with extractors. I was quoted $2,000 with dyno runs, but the bloke said I could knock it down a bit for cash
95 EF Fairmont 5.0 - Heritage Green - 4 Speed auto with AU S5 - 3.23LSD - 17x8" LWT Wheels - King Superlows - 76mm Cobra MAF - 65mm throttle - BPT Underdrive Pulley Kit - 3" Mandrel-bent Lukey exhaust - Tinted Windows - MP3 CD player - White faced dials.
Pacemaker(tuned length 4 into 1's) $580(supplied,fitted by me and my mate)
Twin 2 1/4 mild steel,Hi-Flo Cats, MagnaFlo Resonators and Mufflers, choice of tip(all fitted) for $2000
Same Headers, Cats only into a single 3 inch system with MagnaFlo Muffler and Resonator into my choice of tip for $1600
With the ride height of my car I am looking like I will be unable to run a two into one over the diff and will have to go into a single system before the Diff with either setup so I dunno what I am gonna do yet.
But I was advised 10-15 kw's at both shops as well from either system depending on the motor.
For Full Stainless your looking at another $400 ontop of the above prices.
These are estimates I received(baring in mind they haven't actually seen the car) through AAA Exhaust and Exhaust Tech here in Adelaide
Have you tried DiFilipo ? Way better than all including Pacemaker IMO, big diameter, 4 into one, better up top if anything, suitable for stroker esp but mine is only 5.0 (so far) I have them on my EL, including the cat back system, Everyone comments on the note, unobtrusive in the car and good rwkw, although not worth talking about with many other mods, my 2cents.
Factory exhaust systems can always be improved on. On V8s, I am a fan of a full Twin System (tm) with some form of balance pipe. As for the size, that is dependant upon the Engines capacity and how much power it is making.
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Even though I only have a 289ci in my car, I have custom made pacemaker 1 5/8th extractors (made in 1989) with 3 inch collectors leading into a 3 inch Xpipe then into 2 1/2 inch Borla mufflers - took the bark right out of the old girl and only affects the rear wheel kw by about 15 or so - although the power does drop off at lower than open exhaust by about 500 rpm approx.
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Yes X pipe instead of H pipe seems better these days, more of a twin cam sound. Atleast 1 5/8" primaries and good quality mufflers. Not fussed weather single 3" or twin 2 1/4" Quality of system seems to matter more...4 into one may be more for moded motors also where top end can be taken advantage of..
I'v seen single 3" on some fairly low cars too...
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If you want to make the most of your engines power a single wont do the job a good twin 2 1/2 will do. Just compare the area of the two pipes for a starter. My car lost 0.6 of a second thru the pipes with a twin 2 inch system, but that dropped to 0.2 of a second with the bigger pipes on. It is very important to give your car the 3inch centre Xpipe as it will help no end
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