I like JBAs because they bolt right into where the stock manifolds bolt in...
they flow almost as good as long tubes....
The flange is 3/8" thick and it eliminates flange warping thus exhaust leaks...
www.proficientperformance.com has them with all the smog fittings...
consider the savings of a cheaper long tube header plus the exhaust mod labor along with the headache of constantly fixing leaks....
as compared to the small amount extra you'd have to pay for something that fits with no mods......and works just as well.
I'd say JBAs are worth it.....I have them and I am happy!!!!