You can save a lot of money if you do it yourself, not if you use a stock pipe with a flange that connects to the cat, it will cost you more, a Volvo front pipe is $325, but a 'universal' pipe that doesn't have a flange can be welded into to the cat inlet pipe can cost less than $100. One from an early non-cat 240 like 76-77 is the type.
Starla is good, I have a universal one on my '91 245 that cost me $65 and another $10 to have it welded to the cat directly w/o a flange. It also depens on how good the existing pipe and cat is, needs to have good enough meat on it to weld to. Stock Volvo cats are stainless pipe and can hold up a long time. Doing it this way eliminates the flange gasket & bolt kit, and the trouble of separating it. Just cut the old pipe off behind the flange, bolt the new header pipe to the exhaust manifold and drive open pipe to the muffler shop.
I should also mention to use new flanged lock nuts & gasket on the pipe to manifold, get them from Volvo. Get the car up on jackstands and use a long 1/2 extensions to do the front flange nuts, they need to be very tight, adn teh old one's may be frozen, so expect them to break, use lots of penetrant overnight before you try, or before you have a shop do it, too, otherwise you'll be paying them for extracting broken studs, and will have some financial surprises. If you are not used to doing this sort of job it can be a bear on an old rusty exhaust system.
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