The test increasing element in Drive/RPM is from the Icariin, correct? It's not like introducing an external form of testosterone, which is the kind of stuff that would show up on a test. Icariin is a test mimicer and it raises the circulation of your natural testosterone, so it's actual effect is ambiguous depending on the person's own endo system. I'm not so sure that even at best, it would skew your test in such an exponential way as to raise an eyebrow to an observer. Icariin is "proven" to increase test to a therapeutic level, so far, its only theorized that higher dosages cause a super-compensation.
I don't think either supplements have any real effect on blocking or suppressing estrogen, at least, again, not at any eye brow raising levels.
You will experience strength gains, but there's nothing in these supps that should make you nervous.
P.S. RPM's the Truth.
Edit: All this to say, BOTH.