If I wanted to bypass my cat, for purely experimental reasons of cause, can I use a straight peice of pipe or will i have to buy a box ie magnex bypass kit?

you could go to a place( magnex dealer i think) and get a de-cat pipe made up or if again its like the 1.6 zetec, cut the cat off, weld a bit of pipe(make sure its the right length and bore etc.) then put back in place

if you can get a spare cat just incase for MOT's etc

might be easier to get a de-cat pipe made up tho, your looking at about £50+- i'd say

i want to de-cat my car, apparently 1.4s go a lot better without the cat!

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Suzuki Ignis Sport - ITG Maxogen - Japspeed 4-1 - Decat - 2" custom single box Scorpion exhaust 3" tip - Magnecor leads - Air con Removed - Apex 35mm springs - OMP Strut brace - Whiteline rear arb - EBC Greenstuff front pads - MTEC grooved/drilled discs - Team Dynamics Pro rally 15X6J ET28 - Toyo tyres - Rallyflapz - Black lamps - Smoked repeaters - Sparco pedals - Stripped 40kgs rear interior
125.4BHP 126.6LBFT

Mine can't go much worse!

same ere m8

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Suzuki Ignis Sport - ITG Maxogen - Japspeed 4-1 - Decat - 2" custom single box Scorpion exhaust 3" tip - Magnecor leads - Air con Removed - Apex 35mm springs - OMP Strut brace - Whiteline rear arb - EBC Greenstuff front pads - MTEC grooved/drilled discs - Team Dynamics Pro rally 15X6J ET28 - Toyo tyres - Rallyflapz - Black lamps - Smoked repeaters - Sparco pedals - Stripped 40kgs rear interior
125.4BHP 126.6LBFT

Im putting a four branch manifold with full exhaust system minus the cat on my fiesta this wednesday,I will let you no how good the power gain is, I been told it will be allot better but to be honest i don't think it will effect top speed much but will give the si that extra power it lacks.
I will let use no though if its worth the money for the extra gain.

i cud get a janspeed manifold for my 1.4 si but not sure if it will make much difference.

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Suzuki Ignis Sport - ITG Maxogen - Japspeed 4-1 - Decat - 2" custom single box Scorpion exhaust 3" tip - Magnecor leads - Air con Removed - Apex 35mm springs - OMP Strut brace - Whiteline rear arb - EBC Greenstuff front pads - MTEC grooved/drilled discs - Team Dynamics Pro rally 15X6J ET28 - Toyo tyres - Rallyflapz - Black lamps - Smoked repeaters - Sparco pedals - Stripped 40kgs rear interior
125.4BHP 126.6LBFT

dont expect big gains from not having a cat, but it will make a small difference to an extent though, its a bit like the air filter myth gain; you tend to think its going faster because you can hear it more but its not actually made much difference if you get what i mean. now on a turbo car yes it will make a considerable difference but compared to n/a dont hope for that much. better off for the money just fitting a larger capacity engine or at least buy mods that will fit a larger engine should you decided to upgrade later on.

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rs2k powerd escort mk4.....figured id be different!
http://WWW.S2RS.CO.UK

well said!!, thats 1 reason y im getting air filter and exhaust so its louder so it feels faster!! lol

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Suzuki Ignis Sport - ITG Maxogen - Japspeed 4-1 - Decat - 2" custom single box Scorpion exhaust 3" tip - Magnecor leads - Air con Removed - Apex 35mm springs - OMP Strut brace - Whiteline rear arb - EBC Greenstuff front pads - MTEC grooved/drilled discs - Team Dynamics Pro rally 15X6J ET28 - Toyo tyres - Rallyflapz - Black lamps - Smoked repeaters - Sparco pedals - Stripped 40kgs rear interior
125.4BHP 126.6LBFT

I've got a Magnex bypass, it's just a downpipe with a front silencer on but I got it bundled with a system I bought lol. It doesn't make a great deal of difference but it's worth doing if cheap enough. There is slightly more poke when snatching the throttle.

It definitely does make a difference though, the cat's a fairly big restriction in the exhaust, removing it removes that restriction.

With the Magnex bypass, you get hardly any noise anyway

to an extent it is how it sounds i must admit. i took the si for a road test for the first time earlia this morning and it felt so so slow! then i looked at the clock and realised i wasnt actually going that slow im just used to hearing the batch firing on the escort and the really loud exhaust on the gfs zs.... think im gonna have to make it a tiny bit louder just for my own reasurance cz i can hardly tell if the engine is running or not at the moment in it!

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rs2k powerd escort mk4.....figured id be different!
http://WWW.S2RS.CO.UK

Magnex have gone out of business so if you want a new one then get it quickly.

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Rest in peace Ben "Jam" Elvin. Gone but never forgotten.

when did that happen??

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rs2k powerd escort mk4.....figured id be different!
http://WWW.S2RS.CO.UK

Only just. along with Peco.

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Rest in peace Ben "Jam" Elvin. Gone but never forgotten.

dam it i just gave away what could of been an antique back box in a few hundred yeaers!

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rs2k powerd escort mk4.....figured id be different!
http://WWW.S2RS.CO.UK

Ok, so I've decided to go the cheap route with this one and just smack out all the filler in the cat and put it back on, as read in the "guides" section. I grew some balls today and did a 0-60 test. Warm car, flat road. To be honest I'm far to ashamed to put it on here but it was terrible. If its not the cat holding it back then I'm at a loss and looks like I'm binning the engine or car.

Its dependant on engine how it affects it...for example i no with my 2ltr and a lot of 2ltr zetecs that have has a de-cat you would lose lower torque but would increase Bhp slightly at higher revs. Basically you wont have as much pressure there at low revs to get it going quicker...yet when you get to high revs its more free flow so does help slightly. even if you smash the cat out the air will swirl in the empty chamber...try just a pipe. it might make a little diffrence and it wont be as raspy.

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Project fOOOOrd - coming soon to a forum near you

Bottom end is ok......ish, its mid range, see my flat fiesta thread. Above 3rd gear its a waste of space. But having not driven a healthy 1.4si its hard to compare.

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Project fOOOOrd - coming soon to a forum near you

I'm nowhere already mate. we are talking 28 secs for a 0-60!