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Author Who on here knows their sh*t about exhausts?
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 18:43   View User's Profile U2U Member Reply With Quote
Getting a Powerflow cat-back system for the Astra fitted on saturday.

Now thing is, aside from tailpipe design (I want twin square tailpipes), how can I get them to build me a system for my £330 that will enable me to get as much power as I can out of my lawnmower engine (1.4 16v)?

Not going to decat as I can't be arsed swapping for cat on MOT time, and will probably get a stainless steel Lexmaul or similar manifold in the future, but for now, can anyone help me design a decent system for my Astra?

I have some questions...

- What bore size would it have already, and what size should I get them to use?

- Would it be better to have a pipe from the cat to the back box, instead of having a middle box?

I don't care about how quiet or noisy (within reason) it's gonna be, just want my exhaust to give my engine a bit more poke - don't wanna chav my car up, after all it's only a 1.4 16v Astra auto!
Marc
Member
Registered: 11th Aug 02
Location: York
User status: Offline
28th Mar 05 at 18:49   View User's Profile U2U Member Reply With Quote
To be honest i wouldnt bother modding a 1.4 Astra Auto. Id save up for a bit and get something thats going to actually gain from any potential mods.
Ryan L
Member
Registered: 4th Mar 03
Location: Essex
User status: Offline
28th Mar 05 at 18:52   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Marc
To be honest i wouldnt bother modding a 1.4 Astra Auto. Id save up for a bit and get something thats going to actually gain from any potential mods.


my thoughts exactly, i certainly wouldnt pay £330 for 2-4 BHP gain
Scott McKenzie
Member
Registered: 16th Jul 02
Location: Aberdeenshire Drives: Corsa B 1.6 16v
User status: Offline
28th Mar 05 at 18:54   View User's Profile U2U Member Reply With Quote
I agree, really wouldn`t bother
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 18:57   View User's Profile U2U Member Reply With Quote
Well the thing is the current back and middle boxes have holes in them and I was quoted about £190 to replace them (standard).

So I thought I'd spend the extra £140 and get a stainless system. I'm not going to change the car for the next 5 years as a) I've spent a lot of money on it fixing/maintaining it, and b) I'll be selling it in 5 years and buying a nice Holden Ute with a V8 engine when I move back to Australia!
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 18:59   View User's Profile U2U Member Reply With Quote
I don't want to mod my car just for the sake of it, just want to 'upgrade' it a little to make driving it more bearable!
Ben
Banned
Registered: 12th Jan 03
Location: West Yorkshire
User status: Offline
28th Mar 05 at 18:59   View User's Profile U2U Member Reply With Quote
£190? go to a scrappy and get them for about £40
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 19:02   View User's Profile U2U Member Reply With Quote
But I don't want another standard exhaust system that will just rust in a couple of years time or so!

Can't I just have no exhaust system? It will make the car more lighter too = better performance...
vibrio
Banned
Registered: 28th Feb 01
Location: POAH
User status: Offline
28th Mar 05 at 19:08   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Sam
Getting a Powerflow cat-back system for the Astra fitted on saturday.

Now thing is, aside from tailpipe design (I want twin square tailpipes), how can I get them to build me a system for my £330 that will enable me to get as much power as I can out of my lawnmower engine (1.4 16v)?

Not going to decat as I can't be arsed swapping for cat on MOT time, and will probably get a stainless steel Lexmaul or similar manifold in the future, but for now, can anyone help me design a decent system for my Astra?

I have some questions...

- What bore size would it have already, and what size should I get them to use?

- Would it be better to have a pipe from the cat to the back box, instead of having a middle box?

I don't care about how quiet or noisy (within reason) it's gonna be, just want my exhaust to give my engine a bit more poke - don't wanna chav my car up, after all it's only a 1.4 16v Astra auto!



first of all don't fit a powerflow
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 19:10   View User's Profile U2U Member Reply With Quote
The guy actually told me (I didn't ask him) about the grade of stainless steel they use, and that it's not the crap one that rusts...
Scott McKenzie
Member
Registered: 16th Jul 02
Location: Aberdeenshire Drives: Corsa B 1.6 16v
User status: Offline
28th Mar 05 at 19:11   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by vibrio

first of all don't fit a powerflow

That`s an even better point
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 19:15   View User's Profile U2U Member Reply With Quote
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
28th Mar 05 at 19:18   View User's Profile U2U Member Reply With Quote
powerflow are shite basically

just get a good quality mild steel one, mine has lasted 4 years now, no signs of any probs.

(janspeed btw)
supacook2k
Member
Registered: 26th May 03
User status: Offline
28th Mar 05 at 19:40   View User's Profile U2U Member Reply With Quote
longlife
JJ
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Registered: 20th Apr 00
Location: Northern Ireland
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28th Mar 05 at 19:48   View User's Profile U2U Member Reply With Quote
NEVER buy a powerflow zorst they are shit.
I recommend a nice scorpion group a system sounds the nuts, I have one on my corsa and just love taking it out on weekends and revin the balls off it. I have the car de catted and never had a problem with mot, I know people on here have but mine passes every time.
JJ
Member
Registered: 20th Apr 00
Location: Northern Ireland
User status: Offline
28th Mar 05 at 19:49   View User's Profile U2U Member Reply With Quote
The grade of stainless you need is T304, as featured on the scorpion group A
Fad
Member
Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
User status: Offline
28th Mar 05 at 20:12   View User's Profile U2U Member Reply With Quote
quote:
I don't care about how quiet or noisy (within reason) it's gonna be, just want my exhaust to give my engine a bit more poke - don't wanna chav my car up, after all it's only a 1.4 16v Astra auto!


Then dont go the powercrust and get a poor quality system that will sound crap. If anything i swear u'll loose power Just avoid like the plague
vibrio
Banned
Registered: 28th Feb 01
Location: POAH
User status: Offline
28th Mar 05 at 21:02   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by supacook2k
longlife


same as powerflow -
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 21:46   View User's Profile U2U Member Reply With Quote
Are Longlife and Powerflow the same company?
Sam
Moderator
Premium Member

Registered: 24th Dec 99
Location: West Midlands
User status: Offline
28th Mar 05 at 21:48   View User's Profile U2U Member Reply With Quote
OK some more exhaust questions (general - not manufacturer specific):

- What is the current bore size of my exhaust, is it 1.75"? Would having a 2" bore size be good?

- If I was to get a stainless steel manifold, where can I get one from? I know Regal sell the Lexmaul one for £330, are they any good?

- Are these 'performance cats' any good or just a load of BS?

 
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