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| markr154 |
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Hey all,
My current exhaust system is Pacies, Hi-flo CAT, smallish straight-thru muffler, mandrel bend over rear axle, hot-dog resonator then 3" SS tip (all 2.5" to tip). My engine is stock 4L I6, but I have experienced the following: 1. Before any exhaust mods (std system) - nice smooth response, nippy. 2. Put std 2.5" sports system on from CAT back with lipped tip - nice smooth response, nicer note. 3. Put Pacies on with Hi-flo CAT (kept previous sports system) - note changed, a bit droney & loud, response seemed more sluggish 4. Thought muffler restriction was causing sluggishness, so had muffler replaced on previous system with smaller straight-thru muffler, and 3" unlipped tip welded on = my current system! The problem is, I still find my current system too loud & droney, and the overall response sluggish compared to when I was at stage 2 above! I've seen some threads on this site saying that a larger diameter exhaust system can rob power & response, due to the slowing of exhaust gas speed ...could I be experiencing this? I mean, I had the best note, feel, and response at stage 2 above ...before I added the pacies & hi-flo CAT! Should I consider going back to a std but smaller 2" sports system from CAT back ...to see if I regain any power, and a quieter, SMOOTHER note? HOWEVER, I am seriously considering getting the RPD / Alted Stage 2 cam installed next month ...so should I wait to see how my current system will run with the new cam? ...ANY OPINIONS WOULD BE MOST WELCOME!
_________________ Hot Chilli Red EL XR6, 5-spd, JMM DEV 5 enhanced (161 rwkw custom tuned), Eliminator Switch Chip, 18" BA GTP rims, Pedders Superlows, BA XR6 badges, BA Sunroof, Pioneer Stereo, Splits, 6x9's, 10" sub, 700W 6-ch Viper amp.
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| Gaz |
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i wouldnt bother downgrading your exhaust. not worth the money or effort. if it is to droney ask an exhaust shop to remove the hot dog and put a small muffler in there..
as i siad mine is quiet inside, 400km trip and didnt even notice it, but when the foot is down you can hear it a little inside the cabin and you can hear it going up the street but not from a block away
_________________ 2007 Steel BF Ghia MKII V8 - 19" GTP's + Superlows |
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| falcon4litreOHC |
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You could probably try some pressed bent extractors from the wreckers, although if ya gettin a cam then keep the pacies on.
Cheers............ Last edited by falcon4litreOHC on Mon Jun 26, 2006 1:00 pm, edited 2 times in total. |
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| voxace |
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I reckon it might be the cat. The new one might be advertised as a "high-flow" but might flow worse than stock.
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| GTBob |
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voxace wrote: I reckon it might be the cat. The new one might be advertised as a "high-flow" but might flow worse than stock.
Yeah this has been discussed before some "hiFlow " cats DONT 
_________________ Rotten Old Revhead!!! XW GTHO + EF ex cop car (exractors 2.5 cat back zorst !6" Simmons K&N +airbox mods Lowered with Bilstein shocks+Whiteline Bars NEXT THING Swap HO for GTP or Ferrari! |
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| markr154 |
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GTBob wrote: voxace wrote: I reckon it might be the cat. The new one might be advertised as a "high-flow" but might flow worse than stock. Yeah this has been discussed before some "hiFlow " cats DONT Got it done at Mettam's Mufflers, Morley WA. Any way I can get them to check the CAT flow? What replacement CAT would you recommend ...or should I go back to stock?
_________________ Hot Chilli Red EL XR6, 5-spd, JMM DEV 5 enhanced (161 rwkw custom tuned), Eliminator Switch Chip, 18" BA GTP rims, Pedders Superlows, BA XR6 badges, BA Sunroof, Pioneer Stereo, Splits, 6x9's, 10" sub, 700W 6-ch Viper amp.
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| falcon4litreOHC |
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I would bet some money if all you did was replace the pacies with crappy lukey pressed bent headers, you would gain all your bottom end power back.
. Cheers Last edited by falcon4litreOHC on Mon Jun 26, 2006 12:59 pm, edited 2 times in total. |
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| voxace |
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Yeah the pipes are a tad big on the 4499's, you shouldn't have lost any down low though. Probably just seems that way in comparison to the top end.
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| markr154 |
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[quote="falcon4litreOHC"]I would bet some money if all you did was replace the pacies with crappy lukey pressed bent headers, you would gain all your bottom end power back.
I am looking for some cheap $100 extractors at the moment. I have pacemaker 4499's with a magnaflow high flow cat($$$$) and 2.5in cat back sports systems. I too lost a bit of ooofffff down low. Going to try the 2.25in over the back tailshaft first, been quoted $80 for that. Spoke to a performance workshop about this today... For a start, they reckon I shouldn't have gone above a 2 1/4" system. They also reckon that if I took my centre muffler out (run straight pipe only), and then replaced the hot-dog with a Magnaflo ...I would get all my bottom end back! i.e. Pacies - hiflo CAT - Magnaflo just before tip = some backpressure, and more bottom end power. I'm getting these guys to install my RPD Stage 2 cam in about a months time, so will get them to sort out my exhaust then. Thanks for the advice!
_________________ Hot Chilli Red EL XR6, 5-spd, JMM DEV 5 enhanced (161 rwkw custom tuned), Eliminator Switch Chip, 18" BA GTP rims, Pedders Superlows, BA XR6 badges, BA Sunroof, Pioneer Stereo, Splits, 6x9's, 10" sub, 700W 6-ch Viper amp.
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
falcon4litreOHC wrote: I would bet some money if all you did was replace the pacies with crappy lukey pressed bent headers, you would gain all your bottom end power back.
I am looking for some cheap $100 extractors at the moment. I have pacemaker 4499's with a magnaflow high flow cat($$$$) and 2.5in cat back sports systems. I too lost a bit of ooofffff down low. Going to try the 2.25in over the back tailshaft first, been quoted $80 for that. Cheers how much do you want for the 4499s? |
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
markr154 wrote: 3. Put Pacies on with Hi-flo CAT (kept previous sports system) - note changed, a bit droney & loud, response seemed more sluggish
what pacies did you have put on? 4499 or 4480?? the 4499 would result in a bit of dowyness right down low, as they are more of a mid range and over item. the 4480 will give you back you down low |
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| markr154 |
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tickford_6 wrote: markr154 wrote: 3. Put Pacies on with Hi-flo CAT (kept previous sports system) - note changed, a bit droney & loud, response seemed more sluggish what pacies did you have put on? 4499 or 4480?? the 4499 would result in a bit of dowyness right down low, as they are more of a mid range and over item. the 4480 will give you back you down low Don't have a friggin' clue! The muffler guy just looked up the Pacemaker catalogue, and found the ones for my EF ...didn't offer any alternatives. I have a real drone at low to medium revs, sounds & feels better at high revs. Will get the performance guys to investigate it...
_________________ Hot Chilli Red EL XR6, 5-spd, JMM DEV 5 enhanced (161 rwkw custom tuned), Eliminator Switch Chip, 18" BA GTP rims, Pedders Superlows, BA XR6 badges, BA Sunroof, Pioneer Stereo, Splits, 6x9's, 10" sub, 700W 6-ch Viper amp.
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| voxace |
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The part number is stamped on the extractors, towards the front.
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| markr154 |
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voxace wrote: The part number is stamped on the extractors, towards the front.
OK, will have a look ...have to get shroud out of the way first!
_________________ Hot Chilli Red EL XR6, 5-spd, JMM DEV 5 enhanced (161 rwkw custom tuned), Eliminator Switch Chip, 18" BA GTP rims, Pedders Superlows, BA XR6 badges, BA Sunroof, Pioneer Stereo, Splits, 6x9's, 10" sub, 700W 6-ch Viper amp.
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| Gaz |
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either that or are they straight or do they look liek spaghetti?
_________________ 2007 Steel BF Ghia MKII V8 - 19" GTP's + Superlows |
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