Boxster Performance issue

[Wascott03]

Hi

I recently bought my first porsche boxster 2001 model. It's in a relatively good condition other than the few bumps, scrapes and scratches and a few internal items that I needed to replace.

I have noticed that when the boy racer mood strikes and I reach 4800 - 5000 rpms the engine seems to give a little back, like it's being smothered or something, I don't know how else to explain my problem.

Is there anybody that can maybe give me some advise on this?