Reccomendations for exhaust

[jastra]

Hi all,

Thinking of gettin a catback for the astra, any reccomendations for increased performance but i dont want it to be overly loud. Cheers!

[HappySlapper82]

two and a quarter inch from the cat to a sixteen inch chambered sports muffler with a tip of your choice. Probably cost about three hundred if that

[boorny88]

call up mettams mufflers mate they pritty good hay and yeah 300 sounds bout right

[Shay]

boo hiss, mettams are dodgy.
sorry if you got yours done there, but they are really lazy and stingy, yet charge you top dollar. they do really poor quality welds. and im pretty sure they use mig.

IMO go to grapnel carline, and yeah 2.25" a 12" resonator and as happy said, 16" straight through. id also just get mild steel, unless you can see extensive engine mods in the future, same with pressed bends, unless youve got big plans, just go with them, no need for mandrels

[boorny88]

i had a good job on my old ford but i got my exhaust custom built at another place but i wud have to say my old one on the astra was pritty shitty lol but now stainless from the turbo mandrel and nice ;)

[EL BURITO]

send SKM_87 a pm he works a APC and may be able to hook you up with a decent price, issue is he works in Booragoon

[Konrad]

Went to get my catback system priced by a proffesional and he said dont go 2 1/4 go 2 inch cause you'll lose power and that was for my astra ts 02 considerations really i dont wanna lose throttle response its low as it is =( B> turbo

[HappySlapper82]

Went to get my catback system priced by a proffesional and he said dont go 2 1/4 go 2 inch cause you'll lose power and that was for my astra ts 02 considerations really i dont wanna lose throttle response its low as it is =( B> turbo

2 litre engines and under I would recommend 2 inch but for 4 cylinder engines above 2 litre I would use a 2¼ inch system. With a good 16 inch chambered sports muffler there will be plenty of back pressure.

[Shay]

well jays is a 1.8 ;) nath

[HappySlapper82]

Really? In that big heavy thing :yikes: lol

[Shay]

:yesnod:
unfortunately. only the sri had a 2.2...
cd, cdx, both 1.8

[jastra]

Really? In that big heavy thing :yikes: lol
i no rite bit of a joke :P

[mmahle]

:yesnod:
unfortunately. only the sri had a 2.2...
cd, cdx, both 1.8

Actually the 2008+ SRi N/T models now have 1.8. JIBBED!

[EL BURITO]

Actually the 2008+ SRi N/T models now have 1.8. JIBBED!
there not real SRIs

[CNBLU]

Hi all,

Thinking of gettin a catback for the astra, any reccomendations for increased performance but i dont want it to be overly loud. Cheers!

i would recommend a good quality rear muffler. Wont be too loud and wont attract too much attention. Cat back exhaust is a waste of money, it wont give you any performance in a 1.8lt.

[mmahle]

Getting my little 1.8'er in tommorow to have a look at for a cat back and duel exhaust (for the body kit) I'll mention 2 inch like you guys said. Let you know of the progress.

[gmonkey]

all ya need jason is to change over the stock back box, its really restrictive and dulls the note badly!!! noticed that the exhaust note sounds good near the engine and low revs but sounds like shit by the time it comes out, change the backbox and problem solved :p. But yeh 2 1/2 id do as ultimate maximum and more than that is for the turbo boys

[tomtom]

there not real SRIs

harsh but true :p

[tomburke7]

Hi all,

Thinking of gettin a catback for the astra, any reccomendations for increased performance but i dont want it to be overly loud. Cheers!

A 2 inch hotdog after the CAT (whose outlet is under 2 inches, so it is the major restriction), then a reasonably big bodied straight through muffler in the back. Low restriction after the CAT so performance & fuel economy will be improved. Expect to pay $300 - $400.

http://www.opelaus.com/forums/attachment.php?attachmentid=2509&d=1236241759

http://www.opelaus.com/forums/attachment.php?attachmentid=2565&d=1237525626

.

[gmonkey]

A 2 inch hotdog after the CAT (whose outlet is under 2 inches, so it is the major restriction), then a reasonably big bodied straight through muffler in the back. Low restriction after the CAT so performance & fuel economy will be improved. Expect to pay $300 - $400.

http://www.opelaus.com/forums/attachment.php?attachmentid=2509&d=1236241759

http://www.opelaus.com/forums/attachment.php?attachmentid=2565&d=1237525626

.



anything more than 2 inches on a NA car is really a waste of time.. you will acctually lose performance but...its whats inside the cat is the major restriction a 2 inch exit pipe is fine for a NA.

[Shay]

anything more than 2 inches on a NA car is really a waste of time.. you will acctually lose performance but...its whats inside the cat is the major restriction a 2 inch exit pipe is fine for a NA.

not on a 2.2, or a v8...
on a 1.8 then yes.

[ChrisMaz]

I'll i've heard about metams is bad things. Shit welds and their love of Commonwhores. FILTH

[Shay]

I'll i've heard about metams is bad things. Shit welds and their love of Commonwhores. FILTH

heard mostly from me LOL

[gmonkey]

Even on a 2.2 I think anything over 2inches would be no gain. Bigger you go the slower ur gases will move when u get to a certain volume benelli's law I think? All about venturis and shite. Yes chris filth indeed

[Shay]

Even on a 2.2 I think anything over 2inches would be no gain. Bigger you go the slower ur gases will move when u get to a certain volume benelli's law I think? All about venturis and shite. Yes chris filth indeed

nah mate. 2.2 def 2.25, thats what any good exhaust shop will recommend.

[gmonkey]

I remember exhaust shops saying 2.25 for my 1.6 tx3 lol

[EL BURITO]

I remember exhaust shops saying 2.25 for my 1.6 tx3 lol
but you can all the mods in the world to your TX3 and it was still slower than a stock one