twin 2.5" or twin 3"

[corza3]

just wondering wat would be better for my vx calais 5.7 a twin 2.5" or twin 3" both are going on ebay for $499 and $599 catback im looking for a nice loud note. at the moment im only looking to put cai for performance on at the moment as the finances arnt real good,and what would i need to put the exhaust on myself, any help would be great. also with lowering would king springs superlows all round need any camber kits etc, just want it to sit nice without being to low or to high

[Not_An_Abba_Fan]

Unless you put a cam in it go the 2 1/2" twin. 3" twin may be louder but no benefit over 2 1/2" on a stock engine.

[corza3]

ok thanks will the 2.5" still give it a nice note i dont have extractors or high flow cats yet, wat would be the power gains from a 2.5" or 3" exhaust im looking at a xforce exhaust

[s_ikari2015]

to fit it yourself, I recommend a good car jack, preferably a car lift so you can stand under the car a strong arm, a big hammer and a friend.

It's not entirely rocket science (no offence intended to the exhaust fitters out there) it's just generally a physically challenging task.

EDIT: I've got one of those el-cheapo sports rear mufflers from eBay on my V6 and it's a very nice tone indeed.

[GMMAD]

2.5" will be the go but if you have plans for a cam or H/C get the 3"
ether wont be that loud without headers or high flow cats
i recommend getting your standard cats opened up at least as they are a big restriction
fitting the zorst is a piece of **** I have don it a few times all you need is car stand and some sockets
and do a 2 hole mod with MCAI
as for the camber kit if its a series 2 it has multi link rear which allows you to adjust it if its not you will need one

[corza3]

it is a seriesII and what is the 2 hole mod

[corza3]

also would you recommend saving a bit more and getting extractors and high flow cats all at once with the exhaust as i need to get the car lowered as well i was quoted about 600 for that by jax think it only includes low springs and the alignment should i buy king springs super lows and get someone to put them in for me only if i dont need the camber kit or is it just lows u dont need the kit for. sorry bout all the questions but its been buggin me not knowing what to do with it all

[GMMAD]

Originally Posted by corza3

it is a seriesII and what is the 2 hole mod

2 hole mod is on the lower section of the air box VT-VX come standard with 2 holes 1 90mm which had a pipe conected to it that runs up to the shroud next to the radiator and the second hole is 70mm which runs down under the guard
VY and later only have one hole
the process is you make the second hole 90mm and put the MCAI (monaro cold air induction) it is a shroud that blocks off the hot air from the intake
here is a guide but hasnt got the MCAI but this was is still good I did it this way back in the day
http://swingtan.customer.netspace.net.au/2hole.html
headers and cats would be best bet if you cant afford them you dont have to do them but the standard cats are crap and very restrictive
the std headers arent that bad but i would get the cats opened this will make the exhaust sound better and give you more power and get a tune when funds permit
as for your spring i payed $260 for a set of supper lows and put the rears in my self and got a suspension shop to fit the fronts which cost me $180 including a 4 wheel wheel alignment and i would recommend a set of rear shortened shock as well but you can get away with out it
and the series 2 as a camber adjustment standard
hope this helps

[corza3]

thanks that was very helpful can any muffler place open up the cats is it expensive

[dijm8]

ey man yeh go twin 2.5", its wot ive got dun to mine, sounds awesome, also i have opened up the cats and removed the resi....gotta love v8's

[corza3]

also what cai do you recommend the ss growler kit or the one that sits on your radiator and goes straight into the throttle body.

[GMMAD]

Originally Posted by corza3

thanks that was very helpful can any muffler place open up the cats is it expensive

any zorst shop can do it but some may be more expensive then others
200-$250 is about on the money

[GMMAD]

Originally Posted by corza3

also what cai do you recommend the ss growler kit or the one that sits on your radiator and goes straight into the throttle body.

dont go for the SS reductions kit go for OTR or MCAI