ddecat and exhaust

Hi
First question can I decat my 03 jimny and the 2nd issue can I remove the rear ex box and replsce with larger bore straight through pipe to help my jimny breathe better is this a can do?

You can do whatever you want mate! If you remove the CAT it will fail the MOT on emissions. Most Jimny's barely pass with one fitted. The backbox is an awkward shape to replicate but people have cut further back into the centre section and fitted cherry bombs or motorbike cans. It won't make it any quicker, but it will be louder and we associate noise with speed.

Hahaha at busta,s reply...
From what ive read on here seems you can do whatever you like to the jimnys engine, but it still wont give any more power..
I like the jimny as its such a lovely quite engine, why would you want to make it louder when its a long way from being a throaty V8 ?

Not sure if your comment is aimed at me 11/60 but I hope not because I've never suggested anyone fit a lift kit and gnarly tyres. I would, however, suggest an engine swap to anyone that wants more power. In my experience it is the most cost effective way to achieve it, and one of the single biggest improvements you can make to a Jimny. I've run Jimny's with the cats bashed out and the backbox removed and they make zero difference to the performance. I'm all for people wanting their car to make a nice noise, but there is no performance benefit to removing the cat, and a few downsides which I feel it is important people are made aware of.

11/60 wrote: It's not that at all. There are certain factions in jimnyland that can't see beyond a lift kit, gnarly tyres and an engine swap. Any other modifications are simply not valid whatever the motivation behind them.

As to the op crack on but don't expect to see any massive improvement in performance, its not like remapping a turbocharged engine, there are limits. But it is your car and if you want to roar around, do it.

Not sure I follow. Busta's right. It's pointless trying to get even the slightest more power by opening up the exhaust. It takes a lot more than just that. Intake, valves, hi-comp pistons, remapping etc.. A very costly way of getting more power compared to an engine swap.

Anyone ever tried the 1.6 TB swap? Ive read lots about it, but never seen anyone do it.

I have a liana 1.6 throttle body on mine. It fits straight onto the vvt jimny manifold and made a bit of difference (but i do have a swift 1.6 vvt engine in there as well).

EDIT: forgot to say - you would probably need to fit the 1.6 injectors if swapping the TB

Exhaust i would say is purely for personal preference.

Kiethy made up a turbo onto his which works (but he has blown up one engine already), so i would say you need his god like level of tech knowledge to do that job.

I did the engine conversion myself (electrician), and had no big issues so thats got to be the best option for easy power

Riccy wrote: I have a liana 1.6 throttle body on mine. It fits straight onto the vvt jimny manifold and made a bit of difference (but i do have a swift 1.6 vvt engine in there as well).

EDIT: forgot to say - you would probably need to fit the 1.6 injectors if swapping the TB

Exhaust i would say is purely for personal preference.

Kiethy made up a turbo onto his which works (but he has blown up one engine already), so i would say you need his god like level of tech knowledge to do that job.

I did the engine conversion myself (electrician), and had no big issues so thats got to be the best option for easy power

Might need injectors yes. But the threads I read about it didn't mention it. Apparently the g13bb intake is the same size as the g16b, but the TB is smaller. So 1.6TB is a straight swap on the 1.3, and will give more air.