View Full Version : Pre Cat with or without High Flow Cat?
opal
25th February 2007, 04:17 PM
couldn't see any threads on this so i pose the question:
if i install a 3" precat should i automatically add a high flow cat at the same time?
ie will the benefits of the larger turbo dump be lost or signif reduced without modding the cat??
[currently i have Lukey 2.5" cat back with 3" tip on SriT]
Obviously i dont want to spend $300 - 350 on new cat if i can avoid it...:o
if high flow cat is a goer - then what do ppl recommend?
CNBLU
25th February 2007, 08:31 PM
i have recently put on a 2.5inch mandrel bent with a high flow steel cat but i got all of that for 400. not mates rates just a good customer:D
i do have a 3inch dump pipe with 3inch pre-cat going on wednesday so i can tell you the results then....
CAL.16V
26th February 2007, 12:19 AM
why fit a pre cat aswell.. ditch the precat and get a dump pipe going down to a flexi and then into a hiflow cat.. then normal cat bcak with muffler...
Mr T
26th February 2007, 09:25 AM
^^^^^^^
Yeah what he said.
auzvectra
26th February 2007, 09:46 AM
i didnt even notice that in the 1st thread, as cal.16v said, ditch the precat all togeather, just stick a 3" dump on it.
xplosv57
26th February 2007, 12:16 PM
After spending last week learning about cats and pre cats, yes ditch the bloody thing, its useless except for emissions so get rid of it and go for a dump pipe!!!
1OPL2C
26th February 2007, 12:41 PM
what does the flexi thing do?
CAL.16V
26th February 2007, 01:12 PM
for fwd and 4wd cars.. allows the exhaust to move freely from the engine, instead of with the engine
auzvectra
26th February 2007, 01:32 PM
get rid of it too, but 1st put a powerflex front engine mount in.
it basically stops vibration, n breaking the exhaust.
CAL.16V
26th February 2007, 08:02 PM
why its straight through and only costs $50 for a stinless 3" double braided one
auzvectra
26th February 2007, 08:41 PM
that all hey.
opal
26th February 2007, 09:52 PM
ok - that's one of the problems...
whats the diff b/w pre cat and dump pipe - i thought they were the same thing!
to be clear i have the dump pipe already.
so i now need to decide if it's worth getting a high flow cat (quote $300).
i read Pauly J reckons they're a crock...
what do others think?
auzvectra
26th February 2007, 11:00 PM
high flow cats are just a high volume cat, basicaly they flow more, depending on the brand, and u will never get a definate answer, some will say yes, some will say no.
personally i say yes, but i still have a stock exhaust, so my opinion doesnt mean much :).
CAL.16V
26th February 2007, 11:37 PM
yeah got mine for $45 delivered off ebay.. at exhuast shops they are an extra $80 when i was getting mine..
hi flow cats are $150 delivered off ebay.. they are teh same ones most places use.. stainless ones.. liek xforce or something..
if you want a really proper hiflow cat they are about 3-400 for a metalcat or catco big hi flow job
PaulyJ
27th February 2007, 12:54 AM
i read Pauly J reckons they're a crock...
what do others think?
Hi-flow cats are a necessity if you want more power and keep your car legal. I never said they were a crock. If i did, it was in a sarcastic manner.
I dont have a cat at all, just a 2" pipe going thru it... but thats my choice.
opal
27th February 2007, 05:19 PM
Hi-flow cats are a necessity if you want more power and keep your car legal.
can you be more specific? like is adding a 3"dump pipe making it illegal?
auzvectra
27th February 2007, 09:46 PM
paul talking the main cat, not the precat.
replace the dump pipe (precat) with a 3" without a cat in it.
PaulyJ
27th February 2007, 10:50 PM
Fair enough
I'll leave the turbo talk to you guys.
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