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Hello again everybody, As in title, I managed to reach 104.1 BHP in my K11 1.3 Si after my remap from Ed earlier in the year. Now I have some cash saved up, I need to know exactly what to do next for sheer BHP, power related suggestions only please nothing else :p. What I have done so far...

Ok guys, I think this thread has got me more than enough information (and more :p). Check the link in my sig next week when i've got my new exhaust system made up hopefully! Thanks very much to all you lot as usual :grinning:! Faisal

It's Almera not astra - look at his pictures of manifolds on 1st page, almera car in background - silver boot saying Almera.

Ha ha. 2" it is then going into slightly smaller diameter back box. Would I need a silencer or will sound be OK with 2" straight through pipe (no cats :p)?

Ok this is final, I am getting from manifold to back box 2" straight through pipe. Then back box will remain at 1.77". Case closed. Would I need a silencer or will sound be OK?

What should I do airmike?! HELP :laugh:! Maniflod downpipe 1.57" - Centre pipe 2" - Nismo Back box 1.77" OR Maniflod downpipe 1.57" - Centre pipe 2" - New Back box 2" OR SOMETHING ELSE. PLEASE ADVISE!

Ok, can you get backboxes custom made up though? Do you know any good mandrel-bent exhaust places in or around London? Thanks very much :p

Awesome, will go for 2.5" system. I don't have any cats mate so just a straight through pipe from manifold downpipe to back box. What are your thoughts on back box being smaller diameter TheSam?

I know that is what I want to do but cannot get car up or go under car to do that. Will try take it to garage and measure the Y pipe tomorrow.

Ok, I measured the 421 manifold (pictured below) primary pipes on my K11 and it turns out they are smaller than 2" at 4cm which is 1.57 inches! So should I still have a slightly larger bore mid section at 2 inches rather than sticking to size of manifold pipes which are 1.57 inches? In other...

Mandrel of course, matching the manifold. But I don't know if my backbox is mandrel? Anyone know any cheap mandrel bent exhaust places in or around London (even Birmingham as I'm up there many times a month), just need mid pipe connecting from downpipe to backbox. Thanks

Ok thanks. I will do that - just a 2" mid section and put the 1.77" back box on if that will "keep the velocity of gasses up". Or I may match the diameter of 421 downpipe, I think it is around 2" anyway. Anyone elso feel free to add any advice :p. Thanks very much everyone!

Ok that is fine, the whole middle section from 421 downpipe to back box will be a straight through pipe to match diameter of manifold downpipe. But if my backbox is smaller diameter to middles pipe and manifold is it ok? Also the backbox exit pipe is 90mm, that does not matter does it? Thanks...

Wow! Awesome replies and advice form everyone thanks :grinning:! So I should just match my 4-2-1 manifold diameter when making new exhaust system? And yes I have that Nismo back box from Japan just arrived is still in customs, here is a picture of it's diameter (4.5CM is 1.77 Inches): Ok so...

Hi all, It's time I need to get myself a new exhaust system made up. So I need to know from all you Micra experts what is the best exhaust diameter in terms of performance for my 1.3 Si? I got 104 BHP so what would give the best flow and performance? I have a stainless steel 4-2-1...

AS TITLE, 4 FAIRLY GOOD CONDITION ORIGINAL K11 14" ALLOY WHEELS THAT WERE ON MY 1.3 Si UNTIL I GOT MY NEW ROTA SLIPSTREAMS. THEY COME WITH "OK" STANDARD TYRES, ONE NEEDS REPLACING AS IT IS TORN. PICTURES FITTED TO MY K11: WILL GIVE THEM A JET WASH BEFORE BUYER COLLECTS! (FRONT VERY DIRTY...

I now have fitted and setup (thanks to Ed & Jamie at Fusion :grinning:) the BC COILOVER's on my K11! They are absolutely awesome. Have over 30 damper settings, I'm always changing them depending on where I'm driving to, if I have people in car etc. And the drop looks awesome - probably over 60mm...

Hi everyone. I have for sale the awesome SPAX damper set from Matt Humphris. Originally they cost over £250 from Matt Humphris. They are used in fairly good condition, and are in 100% working order (very slight surface rust and very light cosmetic damage on some areas but absolutely no effect on...

ME! HA HA HA! INSTALLED AND SET UP BY ED & JAMIE AT FUSION MOTORSPORT YESTERDAY! THEY ARE AWESOME! :grinning:

I highly doubt it :suspect:. Was speaking to Matt and Ed regarding this, they said absolutely no difference in performance with the standard Micra NGK's and other plugs.