Fitting SS quiet pack exhaust

Just taken delivery of stainless steel heat exchangers and stainless steel quiet pack exhaust (both from JK) and was just wondering if anyone had tips on installing this?

Also what size hole should I drill in the 4 to 1 section?

Thanks

 

The one for the heat riser? It might be called pre heat pipe, haven't fully investigated it yet

 

You'll have to play it by ear drilling the preheat pipes - it's not easy. Mine was tussle to fit, as well...

 

Buy a very good quality drill bit(s). Stainless is rock hard and you have to hit it at an angle. Sod of a job.

 

Thanks all my dad got a brand New mikita drill set the other day so hopefully that should be okay, the way the pipe is angled you would have to go in at an angle anyway but we will see how it goes!!

Any tips for the fitting in general? Never done any kind of exhaust fitting so basic tips could go a long way!

 

Yes it was
Broke 3 bits , start small then move up

 

Centre punch before you start drilling and start of with a small pilot drill then go up a size at a time untill you have the sized hole you want
Drill at a slow speed and dont force the drill down add oil as you go along to cool the steel

If you go to fast and hard at it and build up too much heat the stainless will harden and make it even more difficult

 

You would think it would be pre drilled

 

Now you tell me

I gave the usual
"Give it Death" approach and super hardened it.

 

I think the assumption is that 4-into-1s are for a twin carb setup. They weld the preheat pipes on almost for appearances sake: they're usually not very well done.

Drilling them through, especially on stainless, will be a bugger of a job (I've tried in the past, and given up). You're trying to drill down a roughly bodged-on tube into a curved surface. It's possible you'll come through the side of the pipe. Either make a pilot hole using a dremel, use a pillar drill, or give up.

If you've got your air filter hot air arrangements sorted, you can likely do without the exhaust preheat. I run without it and it's fine.

 

Can I just ask what size should I drill?

 

I see what your saying but I'd feel happier with it drilled through so it's in theory the same / similar to what I've got currently, don't wAnna cause any future problems

 

You'll have to measure the holes. I'd put money on you coming through the side of the preheat pipe...

 

Ok that's fine, was just checking it wasn't supposed to be smaller for some reason. Really hoping not to go through the pipe

 

As big as you can. I've had most success tickling it with a die grinder but you need good bits.

 

Thanks the drilling went ok broke a couple of bits but the hardest bit was nursing the carb pre heat pipes onto the 4in 1 bit. When the pipes coming off of the carb aren't attached to the exhaust are they meant to wobble a bit? Got worried as we did a bit of prising then removed everything to reset it and noticed that the whole carb moved when we wobbled the pipes

 

You'll need to tighten the bolt that holds the manifold to the crankcase. You'll also likely need to adjust the throttle cable if the carb has moved significantly.