The Peco is Awesome!
Well worth the money. You can actually FEEL the added power. I had what I thought was a "freeflow" exhaust on my car. (This was many, many years ago)
When I put the Peco on the car, I was amazed at the power increase. Plus, I already had a header on it too.
I used to get a kick out of romping on the gas pedal whenever someone would walk by the exhaust in the back. The pressure was so great coming out, that itd scare the "you know what" out of them.
I still get a kick out of that!
If you want to add some performance to your MGB, the money for the PECO is Well spent.
Now, I don't know this for sure, but, it looks like a SCREAMING DEAL at SC Parts in the UK. They have the Header listed on their website at 99.94 GBP which works out to $163. USD, and the exhaust for 104.33GBP which works out to $171.10 USD.
That totals $334.10. Which is an AWESOME DEAL. I don;t know what shipping is, but, even if it was $100, and I doubt that, it would still be a great deal.
Check it out.
BritTek offers it at $525 USD.
I think its the best $500 you can spend on the car. It tucks up nice and neat, and if you get both the header and the exhaust together, you'll have no fitment issues, it'll be fine. Its a big bore system, and I highly suggest painting it with either POR20 Heat Resistant, Aluminized paint. This not only looks awesome, but will protect forever, the system from rust. You could also get it JetHot or other brand of ceramic coating, which is really cool too. For the price, I went with the POR20, we'll see how long that lasts.
BritTek advertises a 15% power increase, and I would probably agree with that. Let me put it this way. You can feel it with the butt detector, and the butt detector, especially mine, is not very accurate, so it takes at least 5-6 hp to get that butt needle moving.
Good Luck,
B