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 Post subject: Paccies For I6
Posted: Sun Aug 03, 2008 11:08 am 
Stock as a Rock

Age: 46

Posts: 119

Joined: 1st Aug 2005

Ride: Au2 & EF

Location: Brisbane
QLD, Australia

Simple answer Headers, Pacemaker comps. There has been dyno tests over & over again & these headers flog the rest except for JMM which cost an arm & a leg. The reason is they were developed for racing for the E series class & JMM developed their version as well. I am using Genies which are ok but don't compare, I got them very cheap. They are mandrel bend they also make a cheaper version non mandrel bend, wildcats. Don't waste your money like I did save for the Pacemaker Comps. As far as exhaust go, go for Redback or Lukey. Stay away from Lukey headers though non mandrel bend.
Posted: Sun Aug 03, 2008 12:31 pm 
Getting Side Ways
User avatar

Age: 44

Posts: 3436

Joined: 23rd Dec 2007

Gallery: 32 images

Ride: BA XR6T (mix of BA, BF and FG)

Location: Perth
WA, Australia

My understanding was that interferance designs like the genies were good for a boost over a wide rpm range...

Tuned length headers like Paceys were going to give you a bigger power spike in a narrow rpm range (the range that they are "tuned" for).
Posted: Sun Aug 03, 2008 12:42 pm 
Getting Side Ways

Age: 49

Posts: 912

Joined: 22nd Mar 2005

Gallery: 1 images

Location: FNQ
QLD, Australia

More Grunt wrote:
I had genies on an eb2 once, with 2.5 inch exhaust and one muffler. sounded perfect. power came on hard after 2900 all the way to the top. sounded chunky as with no drone down low and screamed hard at the top.

Cermaic coating your headers is a good idea as it keeps the gasses that bit hotter (and hotter gas = higher velocity, which in turn = more torque and hp).

Mandrel bends are a must at the headers, but if on a budget not 100% neccesary on the exhaust. on a 2.5 crush bent system the worst it will go down to is 2.25 inch, and thats about the restriction of a sports muffler anyway.

Only really worth getting mandrel bent exhaust if you have high flow cat, and straight through low restriction muffler, for example hooker aerochamber which flows 98% of a 2.5 inch pipe.

If you have stacks of cash pacemaker 4480's (ceramic coated) with a high flow 2.5 inch metal cat, 2.5 mandrel stainless steel exhaust, hooker aero muffler, and one ressi should be the go. its my ideal system anyway. Just dont have stacks of cash rofl.

You might be interested: - I've got an Aerochamber on my car with all 2.5 inch pipework and 4480 Pacemakers. When I got the Aerochamber I already had the 4480's but the rest was a crap cobbled together mess - so I had a new decent quality 2.5 cat fitted along with what I think was a redback system - it had a hotdog after the cat, then went thru the Aerochamber and finally had a dogleg straight thru rear muffler - the note was very nice but the whole thing was as quiet as a std system! It was really funny because the exhaust place didn't want to fit the Aerochamber - they reckoned it was physically too big (in the end it fits fine) and they also reckoned it would be too loud - they talked me into having the dogleg rear muffler - but as I said: in fact it ended up too quiet!!

This is where the difficulty came in.... - I figured that if I had the dogleg muffler taken off the rear and a CHAMBER resonator or small straight thru chamber type muffler put on the front in place of the hotdog it'd be perfect (I've previously eliminated bark and drone completely successfully by doing that).

Unfortunately the place that fitted it all was happy to take off the rear dogleg muffler but were adamant they couldn't fit a chamber resonator or muffler up the front and instead just fitted a large hotdog - so the result has been that it sounds lovely and overall is perfect volume - but it's got that awful drone at about 2000rpm or so that's worse at part throttle than under heavy acceleration if you know what I mean (in fact it's louder at part throttle and 2000ish rpm than flat out at 5700rpm). I've left it be for the time being but will be trying some other exhaust places until I find one that will simply do what I'm F-ing asking for and fit a chamber resonator or muffler to the front.

What I set out to do: 4480 extractors, 2.5 cat, Aerochamber offset in, centre out muffler - EXPECTED result = good note, not too loud, no drone.

What I got: 4480 extractors, ceramic 2.5 inch cat, large hotdog, Aerochamber centre in, centre out muffler, rear dogleg straight thru muffler - result = lovely note, very quiet - pretty much stock volume.

So in short, the Aerochamber muffler gives a very nice note and volume BUT it needs a chamber resonator or chamber type muffler up front behind the cat to get rid of the dreaded drone.

Also, I could only get hold of a centre in, centre out Aerochamber (2.5 inch of course) - but an offset in, offset out or offset in, centre out would make installation much easier - and in fact, considering that the perforated pipe straight thru dogleg muffler REALLY quietened the system down and absolutely killed ANY drone - possibly an offset in, centre out Aerochamber might be an all-in-one solution and enable you to just run the single muffler with no need for a nything up front to control drone.



96 EF Auto GLi - Bilstein Shocks - Adjustable Front sway bar - JMM Cam - TI Perf J3 - TCI 2500/3000 stall converter. 2015 Jeep Cherokee Trailhawk.

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