headers

Does anyone have aftermarket exhaust headers on their 5.3 Alpha? I've been thinking about freshening up my 260,000-mile engine with a new set of these https://www.summitracing.com/parts/sum-ls210cath64 in the next year. And if I'm that deep into the motor, I'll get some better headers to go with...

I'm thinking of trading in my i5 for an alpha for that extra power. Displacement is needed, but I'm not so keen on the gearing ratio. Problem is, I've already invested so much time & $$$ fixing up the i5... Catback, intake, PCM tune.. The only thing missing are headers, and perhaps a ported...