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[Andy B]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

[STEMO]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Are you being pedantic there, Andy? 8mm drill for an M8 bolt?

[Enceladus]

The cats look to be 'type approved'. What make are they?

[biggriffin]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Because a 5/16, is a bit bigger, and allows bolts to fit better.

[biggriffin]

The cats look to be 'type approved'. What make are they?

  No I won't say it

[Andy B]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Because a 5/16, is a bit bigger, and allows bolts to fit better.

No it's not .... if anything it's a bit smaller. 5/16" = 7.9375mm
https://www.google.com/search?q=5%2F16+to+mm&rlz=1C1CHBF_en-GBGB804GB804&oq=5%2F16&aqs=chrome.2.69i57j6j0l6.4094j0j8&sourceid=chrome&ie=UTF-8

5/16 x 25.4 = 7.9375mm 

[Andy B]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Are you being pedantic there, Andy? 8mm drill for an M8 bolt?

No .... just wondered why a drill smaller than 8mm was being suggested for a M8 clearance drill. Tapping for M8 is 6.8mm which is near enough to 17/64" 

[henryd]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Are you being pedantic there, Andy? 8mm drill for an M8 bolt?

No .... just wondered why a drill smaller than 8mm was being suggested for a M8 clearance drill. Tapping for M8 is 6.8mm which is near enough to 17/64" 

I shall have to dig out my old Zeus book to check !

[Doctor Gollum]

Or use an M6 nut and bolt with a couple of washers and not drill anything...   

[Andy B]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Are you being pedantic there, Andy? 8mm drill for an M8 bolt?

No .... just wondered why a drill smaller than 8mm was being suggested for a M8 clearance drill. Tapping for M8 is 6.8mm which is near enough to 17/64" 

I shall have to dig out my old Zeus book to check !

Just take my word for it 

[biggriffin]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Because a 5/16, is a bit bigger, and allows bolts to fit better.

No it's not .... if anything it's a bit smaller. 5/16" = 7.9375mm
https://www.google.com/search?q=5%2F16+to+mm&rlz=1C1CHBF_en-GBGB804GB804&oq=5%2F16&aqs=chrome.2.69i57j6j0l6.4094j0j8&sourceid=chrome&ie=UTF-8

5/16 x 25.4 = 7.9375mm 

 Either chinqy Drill bits I got from my last job are bigger, or the bolts from same are smaller... I will measure .

[LC0112G]

Yes, they're the type approved ones. The manufacturer is "BM". No idea if that's good, bad or indifferent. The thought process was...

Q) Do I need type approved or not?
A) Probably do need type approved legally - Y reg 2001, so after the cut-off date.
Q) What are the chances of getting caught if I went cheap?
A) Miniscule, verging on non existant.
Q) What are the downsides of going cheap?
A) Possible lower life expectancy, though I suspect some of that is marketing bullshine.
Q) What are the downsides of going type approved?
A) Well that's obvious - £70 a side.
Q) What are the upsides of going cheap?
A) Same as the previous answer.
Q) What are the upsides of going type approved?
A) Possible longer life, better for the environment, legally more defensible,
Q) Do I care about the environment?
A) Err - I'm driving a 20 year old gas guzzler. Greta ain't my friend.

So it boiled down to did I want to gamble £140 on a (possibly) earlier than necessary MOT emissions failure vs the aggro of having to do the job again. £140 is 2 tanks of petrol. Doing it all again is a day's work and whilst I quite enjoy tinkering I'm getting too old for this. Plus I'd never knowingly break the law  I realise others may have come to a different conclusion.

[LC0112G]

Not sure what the objection to SS nut/bolts is?

I realise they aren't as strong as 8.8's and do have a tendency to bind when used in heat cycling applications. However, a well respected exhaust manufacturer (who visits this manor and has posted in this thread!) once told me words to the effect either use stainless nuts and steel bolts, or vice verca to avoid this. I've been using SS nuts and bolts on the mid section of the LC for years and never had any problems (although from memory they are M12 so considerably bigger).

Do I intend to take the exhaust off again? Not if I don't have to. However, failing to plan is planning to fail. 

Oh - and I've only got metric drill bits. M8 it is then.

[Nick W]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Because a 5/16, is a bit bigger, and allows bolts to fit better.

No it's not .... if anything it's a bit smaller. 5/16" = 7.9375mm
https://www.google.com/search?q=5%2F16+to+mm&rlz=1C1CHBF_en-GBGB804GB804&oq=5%2F16&aqs=chrome.2.69i57j6j0l6.4094j0j8&sourceid=chrome&ie=UTF-8

5/16 x 25.4 = 7.9375mm 

which is still adequate clearance for an M8 bolt

[Andy B]

Drill the flanges, out, fit nuts n bolts. 5/16 drill bit, then fit M8, nuts/bolts.

Why not use an 8mm drill 

Because a 5/16, is a bit bigger, and allows bolts to fit better.

No it's not .... if anything it's a bit smaller. 5/16" = 7.9375mm
https://www.google.com/search?q=5%2F16+to+mm&rlz=1C1CHBF_en-GBGB804GB804&oq=5%2F16&aqs=chrome.2.69i57j6j0l6.4094j0j8&sourceid=chrome&ie=UTF-8

5/16 x 25.4 = 7.9375mm 

which is still adequate clearance for an M8 bolt

Never said it wasn't. Just curious why 5/16 was preferred over an 8mm